What is the ubuntu 16.04 lts server default login & password?

When i installed dual boot ubuntu 16.04 lts server i did not entry any ubuntu server login & password when i opened ubuntu server it wants login & password.What is the ubuntu 16.04 lts server default login & password ?or How to open ubuntu server?

asked Nov 23 '18 at 3:27

Mafuj Shikder

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asked Nov 23 '18 at 3:27

Mafuj Shikder

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asked Nov 23 '18 at 3:27

Mafuj Shikder

linux ubuntu ubuntu-10.04 ubuntu-14.04

asked Nov 23 '18 at 3:27

Mafuj Shikder

asked Nov 23 '18 at 3:27

Mafuj Shikder

asked Nov 23 '18 at 3:27

Mafuj Shikder

asked Nov 23 '18 at 3:27

Mafuj Shikder

asked Nov 23 '18 at 3:27

Mafuj Shikder

add a comment |

2 Answers
2

active

oldest

votes

If you don't remember the password, you can reset it with a liveCD/USB, you need to boot the USB, mount your root partition, chroot and reset the password:

# mkdir /mnt/ubuntu

# mount /dev/sdXY /mnt/ubutnu # your partition numeber

# chroot /mnt/ubuntu /bin/bash

# passwd [your username] # here you reset the password

# exit

# reboot

If You want to know your username put this command in your chroot environment:

# grep 1000 /etc/passwd

It should be the last one and the UID should be 1000 on a fresh installation
if you have not a UID 1000 means you have not created a username, so add it, always on your chroot environment:

# uaseradd -s /bin/bash -G users,wheel,... [your username]

# passwd [your username]

edited Nov 23 '18 at 6:50

Kamil Maciorowski

24.5k155277

answered Nov 23 '18 at 6:15

ensarman

212

Note: not every liveCD/USB will work: (1) the implicit premise is it contains Linux; (2) chroot will use the kernel of this live OS, version mismatch may be an issue in general (although the mentioned commands should not be picky, I guess).
– Kamil Maciorowski
Nov 23 '18 at 7:09

first... thanks, about the editing... my english is not perfect :P second... It is true, Its recommended to use the same liveCD/USB used to install the SO
– ensarman
Nov 23 '18 at 16:46

Even with use of the actual install media you may have a mismatch, e.g. if there has been updates that included changes to system portions that affects what you're about to handle.
– Hannu
22 hours ago

add a comment |

With Ubuntu, you do not need to boot a live CD (and chroot) as you should be able to use the ... (recovery mode) option in the grub menus.

To see the grub menu; hold SHIFT as the BIOS ends it's boot-up display.

Select the recovery mode with the cursor keys (then press ENTER) and a new menu appears.

Select and press enter on
fsck Check all file systems

to make all filesystems writable.

Select and press enter on
network Enable networking

... if also need networking (e.g. to run apt-get)

Select and press enter on
root Drop to root shell prompt

... and ENTER once more, to get the root shell prompt.

Now use useradd, usermod, userdel and passwd in the normal way to reset password(s) or create/modify/remove users.

Note also: ALL answers here should be considered "$3cur1ty h0l3z" - anybody with physical access to the machine can do this; root access without effort. So, what to do? -> Keep your computer in a locked room.

edited Dec 4 '18 at 10:42

answered Nov 23 '18 at 13:14

Hannu

3,9851925

add a comment |

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2 Answers
2

active

oldest

votes

2 Answers
2

active

oldest

votes

If you don't remember the password, you can reset it with a liveCD/USB, you need to boot the USB, mount your root partition, chroot and reset the password:

# mkdir /mnt/ubuntu

# mount /dev/sdXY /mnt/ubutnu # your partition numeber

# chroot /mnt/ubuntu /bin/bash

# passwd [your username] # here you reset the password

# exit

# reboot

If You want to know your username put this command in your chroot environment:

# grep 1000 /etc/passwd

It should be the last one and the UID should be 1000 on a fresh installation
if you have not a UID 1000 means you have not created a username, so add it, always on your chroot environment:

# uaseradd -s /bin/bash -G users,wheel,... [your username]

# passwd [your username]

edited Nov 23 '18 at 6:50

Kamil Maciorowski

24.5k155277

answered Nov 23 '18 at 6:15

ensarman

212

Note: not every liveCD/USB will work: (1) the implicit premise is it contains Linux; (2) chroot will use the kernel of this live OS, version mismatch may be an issue in general (although the mentioned commands should not be picky, I guess).
– Kamil Maciorowski
Nov 23 '18 at 7:09

first... thanks, about the editing... my english is not perfect :P second... It is true, Its recommended to use the same liveCD/USB used to install the SO
– ensarman
Nov 23 '18 at 16:46

Even with use of the actual install media you may have a mismatch, e.g. if there has been updates that included changes to system portions that affects what you're about to handle.
– Hannu
22 hours ago

add a comment |

If you don't remember the password, you can reset it with a liveCD/USB, you need to boot the USB, mount your root partition, chroot and reset the password:

# mkdir /mnt/ubuntu

# mount /dev/sdXY /mnt/ubutnu # your partition numeber

# chroot /mnt/ubuntu /bin/bash

# passwd [your username] # here you reset the password

# exit

# reboot

If You want to know your username put this command in your chroot environment:

# grep 1000 /etc/passwd

It should be the last one and the UID should be 1000 on a fresh installation
if you have not a UID 1000 means you have not created a username, so add it, always on your chroot environment:

# uaseradd -s /bin/bash -G users,wheel,... [your username]

# passwd [your username]

edited Nov 23 '18 at 6:50

Kamil Maciorowski

24.5k155277

answered Nov 23 '18 at 6:15

ensarman

212

Note: not every liveCD/USB will work: (1) the implicit premise is it contains Linux; (2) chroot will use the kernel of this live OS, version mismatch may be an issue in general (although the mentioned commands should not be picky, I guess).
– Kamil Maciorowski
Nov 23 '18 at 7:09

first... thanks, about the editing... my english is not perfect :P second... It is true, Its recommended to use the same liveCD/USB used to install the SO
– ensarman
Nov 23 '18 at 16:46

Even with use of the actual install media you may have a mismatch, e.g. if there has been updates that included changes to system portions that affects what you're about to handle.
– Hannu
22 hours ago

add a comment |

If you don't remember the password, you can reset it with a liveCD/USB, you need to boot the USB, mount your root partition, chroot and reset the password:

# mkdir /mnt/ubuntu

# mount /dev/sdXY /mnt/ubutnu # your partition numeber

# chroot /mnt/ubuntu /bin/bash

# passwd [your username] # here you reset the password

# exit

# reboot

If You want to know your username put this command in your chroot environment:

# grep 1000 /etc/passwd

It should be the last one and the UID should be 1000 on a fresh installation
if you have not a UID 1000 means you have not created a username, so add it, always on your chroot environment:

# uaseradd -s /bin/bash -G users,wheel,... [your username]

# passwd [your username]

edited Nov 23 '18 at 6:50

Kamil Maciorowski

24.5k155277

answered Nov 23 '18 at 6:15

ensarman

212

If you don't remember the password, you can reset it with a liveCD/USB, you need to boot the USB, mount your root partition, chroot and reset the password:

# mkdir /mnt/ubuntu

# mount /dev/sdXY /mnt/ubutnu # your partition numeber

# chroot /mnt/ubuntu /bin/bash

# passwd [your username] # here you reset the password

# exit

# reboot

If You want to know your username put this command in your chroot environment:

# grep 1000 /etc/passwd

It should be the last one and the UID should be 1000 on a fresh installation
if you have not a UID 1000 means you have not created a username, so add it, always on your chroot environment:

# uaseradd -s /bin/bash -G users,wheel,... [your username]

# passwd [your username]

edited Nov 23 '18 at 6:50

Kamil Maciorowski

24.5k155277

answered Nov 23 '18 at 6:15

ensarman

212

edited Nov 23 '18 at 6:50

Kamil Maciorowski

24.5k155277

edited Nov 23 '18 at 6:50

Kamil Maciorowski

24.5k155277

edited Nov 23 '18 at 6:50

Kamil Maciorowski

24.5k155277

answered Nov 23 '18 at 6:15

ensarman

212

answered Nov 23 '18 at 6:15

ensarman

212

answered Nov 23 '18 at 6:15

ensarman

212

Note: not every liveCD/USB will work: (1) the implicit premise is it contains Linux; (2) chroot will use the kernel of this live OS, version mismatch may be an issue in general (although the mentioned commands should not be picky, I guess).
– Kamil Maciorowski
Nov 23 '18 at 7:09

first... thanks, about the editing... my english is not perfect :P second... It is true, Its recommended to use the same liveCD/USB used to install the SO
– ensarman
Nov 23 '18 at 16:46

Even with use of the actual install media you may have a mismatch, e.g. if there has been updates that included changes to system portions that affects what you're about to handle.
– Hannu
22 hours ago

add a comment |

Note: not every liveCD/USB will work: (1) the implicit premise is it contains Linux; (2) chroot will use the kernel of this live OS, version mismatch may be an issue in general (although the mentioned commands should not be picky, I guess).
– Kamil Maciorowski
Nov 23 '18 at 7:09

first... thanks, about the editing... my english is not perfect :P second... It is true, Its recommended to use the same liveCD/USB used to install the SO
– ensarman
Nov 23 '18 at 16:46

Even with use of the actual install media you may have a mismatch, e.g. if there has been updates that included changes to system portions that affects what you're about to handle.
– Hannu
22 hours ago

Note: not every liveCD/USB will work: (1) the implicit premise is it contains Linux; (2) chroot will use the kernel of this live OS, version mismatch may be an issue in general (although the mentioned commands should not be picky, I guess).
– Kamil Maciorowski
Nov 23 '18 at 7:09

first... thanks, about the editing... my english is not perfect :P second... It is true, Its recommended to use the same liveCD/USB used to install the SO
– ensarman
Nov 23 '18 at 16:46

Even with use of the actual install media you may have a mismatch, e.g. if there has been updates that included changes to system portions that affects what you're about to handle.
– Hannu
22 hours ago

add a comment |

With Ubuntu, you do not need to boot a live CD (and chroot) as you should be able to use the ... (recovery mode) option in the grub menus.

To see the grub menu; hold SHIFT as the BIOS ends it's boot-up display.

Select the recovery mode with the cursor keys (then press ENTER) and a new menu appears.

Select and press enter on
fsck Check all file systems

to make all filesystems writable.

Select and press enter on
network Enable networking

... if also need networking (e.g. to run apt-get)

Select and press enter on
root Drop to root shell prompt

... and ENTER once more, to get the root shell prompt.

Now use useradd, usermod, userdel and passwd in the normal way to reset password(s) or create/modify/remove users.

edited Dec 4 '18 at 10:42

answered Nov 23 '18 at 13:14

Hannu

3,9851925

add a comment |

With Ubuntu, you do not need to boot a live CD (and chroot) as you should be able to use the ... (recovery mode) option in the grub menus.

To see the grub menu; hold SHIFT as the BIOS ends it's boot-up display.

Select the recovery mode with the cursor keys (then press ENTER) and a new menu appears.

Select and press enter on
fsck Check all file systems

to make all filesystems writable.

Select and press enter on
network Enable networking

... if also need networking (e.g. to run apt-get)

Select and press enter on
root Drop to root shell prompt

... and ENTER once more, to get the root shell prompt.

Now use useradd, usermod, userdel and passwd in the normal way to reset password(s) or create/modify/remove users.

edited Dec 4 '18 at 10:42

answered Nov 23 '18 at 13:14

Hannu

3,9851925

add a comment |

With Ubuntu, you do not need to boot a live CD (and chroot) as you should be able to use the ... (recovery mode) option in the grub menus.

To see the grub menu; hold SHIFT as the BIOS ends it's boot-up display.

Select the recovery mode with the cursor keys (then press ENTER) and a new menu appears.

Select and press enter on
fsck Check all file systems

to make all filesystems writable.

Select and press enter on
network Enable networking

... if also need networking (e.g. to run apt-get)

Select and press enter on
root Drop to root shell prompt

... and ENTER once more, to get the root shell prompt.

Now use useradd, usermod, userdel and passwd in the normal way to reset password(s) or create/modify/remove users.

edited Dec 4 '18 at 10:42

answered Nov 23 '18 at 13:14

Hannu

3,9851925

With Ubuntu, you do not need to boot a live CD (and chroot) as you should be able to use the ... (recovery mode) option in the grub menus.

To see the grub menu; hold SHIFT as the BIOS ends it's boot-up display.

Select the recovery mode with the cursor keys (then press ENTER) and a new menu appears.

Select and press enter on
fsck Check all file systems

to make all filesystems writable.

Select and press enter on
network Enable networking

... if also need networking (e.g. to run apt-get)

Select and press enter on
root Drop to root shell prompt

... and ENTER once more, to get the root shell prompt.

Now use useradd, usermod, userdel and passwd in the normal way to reset password(s) or create/modify/remove users.

edited Dec 4 '18 at 10:42

answered Nov 23 '18 at 13:14

Hannu

3,9851925

edited Dec 4 '18 at 10:42

answered Nov 23 '18 at 13:14

Hannu

3,9851925

answered Nov 23 '18 at 13:14

Hannu

3,9851925

answered Nov 23 '18 at 13:14

Hannu

3,9851925

add a comment |

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