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How can I install sudo without using su? [duplicate]

Can sudo be reinstalled after being removed?How do I reset a lost administrative password?SU, SUDO and Upgrade problemStandards accounts are able to get root access using sudo without password requestSudo hangs without prompting for passwordNo root privileges when using GUIWhat is the command to switch to normal user?Authentication failureRedirection operator priority in BashInstall mobile partner using super userHow to be root on liveUSB?Trusty - Sudo password?

3

This question already has an answer here:

• 
  Can sudo be reinstalled after being removed?
  
  7 answers
  
  

I need to use sudo but when I try to use it, a prompt tells me the command is not found and I need to install sudo.

So when I switch to su so I can gain root access to install sudo, it says auth failure

How can I fix this?

18.04 sudo su administrator

share|improve this question

edited 17 hours ago

Kulfy

4,81651743

asked 17 hours ago

Gijs ClaesGijs Claes

161

New contributor

Gijs Claes is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

marked as duplicate by Kulfy, Pilot6, karel, Zanna, dessert 9 hours ago

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

• 
  
  
  

  
  3
  

  
  
  
  
  
  

  
  
  You might need to enter the recovery mode at the Grub menu, select the 'root shell', and try installing sudo. Not sure will work though. Obviously, sudo is preinstalled by default, and removing it was a bad idea.
  
  – mikewhatever
  17 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  See also: unix.stackexchange.com/q/333061/140314
  
  – OldBunny2800
  12 hours ago
  

  
  
  
  

add a comment | 

3

This question already has an answer here:

• 
  Can sudo be reinstalled after being removed?
  
  7 answers
  
  

I need to use sudo but when I try to use it, a prompt tells me the command is not found and I need to install sudo.

So when I switch to su so I can gain root access to install sudo, it says auth failure

How can I fix this?

18.04 sudo su administrator

share|improve this question

edited 17 hours ago

Kulfy

4,81651743

asked 17 hours ago

Gijs ClaesGijs Claes

161

New contributor

Gijs Claes is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

marked as duplicate by Kulfy, Pilot6, karel, Zanna, dessert 9 hours ago

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

• 
  
  
  

  
  3
  

  
  
  
  
  
  

  
  
  You might need to enter the recovery mode at the Grub menu, select the 'root shell', and try installing sudo. Not sure will work though. Obviously, sudo is preinstalled by default, and removing it was a bad idea.
  
  – mikewhatever
  17 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  See also: unix.stackexchange.com/q/333061/140314
  
  – OldBunny2800
  12 hours ago
  

  
  
  
  

add a comment | 

This question already has an answer here:

• 
  Can sudo be reinstalled after being removed?
  
  7 answers
  
  

I need to use sudo but when I try to use it, a prompt tells me the command is not found and I need to install sudo.

So when I switch to su so I can gain root access to install sudo, it says auth failure

How can I fix this?

18.04 sudo su administrator

share|improve this question

edited 17 hours ago

Kulfy

4,81651743

asked 17 hours ago

Gijs ClaesGijs Claes

161

New contributor

Gijs Claes is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

share|improve this question

edited 17 hours ago

Kulfy

4,81651743

asked 17 hours ago

Gijs ClaesGijs Claes

161

New contributor

Gijs Claes is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

share|improve this question

edited 17 hours ago

Kulfy

4,81651743

asked 17 hours ago

Gijs ClaesGijs Claes

161

New contributor

Gijs Claes is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

edited 17 hours ago

Kulfy

4,81651743

edited 17 hours ago

Kulfy

4,81651743

asked 17 hours ago

Gijs ClaesGijs Claes

161

New contributor

Gijs Claes is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

asked 17 hours ago

Gijs ClaesGijs Claes

161

1 Answer
1

active

oldest

votes

11

Boot up the machine, and after the BIOS screen, hold down the left Shift key. You will then be prompted by a menu that looks something like this:

If instead you get options like:

You need to go to Advanced Options using arrow keys and hit Enter and then choose the recovery mode

Hit the down arrow until you select the 2nd entry from the top (the one with the recovery mode in the description) and then hit Enter.

Now you should see this menu:

Using the arrow keys scroll down to network and hit Enter to enable networking. If asked to remount the partition, hit Enter on yes.

And then go to root in the same menu and then hit Enter.

You should now see a root prompt, something like this:

root@gijs-pc:~#

At this stage you might have a read-only filesystem. You have to remount it with write permissions:

mount -o remount,rw /

now, install sudo by:

apt install sudo

check your sudo settings once again by:

visudo

also, check if your account gijs is a member of sudo
If not, add him as a member of sudo and wheel group by:

usermod -aG sudo gijs

usermod -aG wheel gijs

Now, you may restart and you now should have access to sudo.

This answer is abridged version of Jorge Castro's answer on How do I reset a lost administrative password?

share|improve this answer

edited 11 hours ago

answered 17 hours ago

Varun ChhanganiVarun Chhangani

12819

• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  Maybe you should enable network before dropping to root shell !!
  
  – Soren A
  17 hours ago
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @SorenA sorry and thanks. Changed it
  
  – Varun Chhangani
  17 hours ago
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Hmm.. Indeed as @Olorin said, It is a duplicate. Surely, we can use pkexec too
  
  – Varun Chhangani
  16 hours ago
  

  
  
  
  

add a comment | 

11

Boot up the machine, and after the BIOS screen, hold down the left Shift key. You will then be prompted by a menu that looks something like this:

If instead you get options like:

You need to go to Advanced Options using arrow keys and hit Enter and then choose the recovery mode

Hit the down arrow until you select the 2nd entry from the top (the one with the recovery mode in the description) and then hit Enter.

Now you should see this menu:

Using the arrow keys scroll down to network and hit Enter to enable networking. If asked to remount the partition, hit Enter on yes.

And then go to root in the same menu and then hit Enter.

You should now see a root prompt, something like this:

root@gijs-pc:~#

At this stage you might have a read-only filesystem. You have to remount it with write permissions:

mount -o remount,rw /

now, install sudo by:

apt install sudo

check your sudo settings once again by:

visudo

also, check if your account gijs is a member of sudo
If not, add him as a member of sudo and wheel group by:

usermod -aG sudo gijs

usermod -aG wheel gijs

Now, you may restart and you now should have access to sudo.

This answer is abridged version of Jorge Castro's answer on How do I reset a lost administrative password?

share|improve this answer

edited 11 hours ago

answered 17 hours ago

Varun ChhanganiVarun Chhangani

12819

• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  Maybe you should enable network before dropping to root shell !!
  
  – Soren A
  17 hours ago
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @SorenA sorry and thanks. Changed it
  
  – Varun Chhangani
  17 hours ago
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Hmm.. Indeed as @Olorin said, It is a duplicate. Surely, we can use pkexec too
  
  – Varun Chhangani
  16 hours ago
  

  
  
  
  

add a comment | 

11

Boot up the machine, and after the BIOS screen, hold down the left Shift key. You will then be prompted by a menu that looks something like this:

If instead you get options like:

You need to go to Advanced Options using arrow keys and hit Enter and then choose the recovery mode

Hit the down arrow until you select the 2nd entry from the top (the one with the recovery mode in the description) and then hit Enter.

Now you should see this menu:

Using the arrow keys scroll down to network and hit Enter to enable networking. If asked to remount the partition, hit Enter on yes.

And then go to root in the same menu and then hit Enter.

You should now see a root prompt, something like this:

root@gijs-pc:~#

At this stage you might have a read-only filesystem. You have to remount it with write permissions:

mount -o remount,rw /

now, install sudo by:

apt install sudo

check your sudo settings once again by:

visudo

also, check if your account gijs is a member of sudo
If not, add him as a member of sudo and wheel group by:

usermod -aG sudo gijs

usermod -aG wheel gijs

Now, you may restart and you now should have access to sudo.

This answer is abridged version of Jorge Castro's answer on How do I reset a lost administrative password?

share|improve this answer

edited 11 hours ago

answered 17 hours ago

Varun ChhanganiVarun Chhangani

12819

• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  Maybe you should enable network before dropping to root shell !!
  
  – Soren A
  17 hours ago
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @SorenA sorry and thanks. Changed it
  
  – Varun Chhangani
  17 hours ago
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Hmm.. Indeed as @Olorin said, It is a duplicate. Surely, we can use pkexec too
  
  – Varun Chhangani
  16 hours ago
  

  
  
  
  

add a comment | 

Boot up the machine, and after the BIOS screen, hold down the left Shift key. You will then be prompted by a menu that looks something like this:

If instead you get options like:

You need to go to Advanced Options using arrow keys and hit Enter and then choose the recovery mode

Hit the down arrow until you select the 2nd entry from the top (the one with the recovery mode in the description) and then hit Enter.

Now you should see this menu:

Using the arrow keys scroll down to network and hit Enter to enable networking. If asked to remount the partition, hit Enter on yes.

And then go to root in the same menu and then hit Enter.

You should now see a root prompt, something like this:

root@gijs-pc:~#

At this stage you might have a read-only filesystem. You have to remount it with write permissions:

mount -o remount,rw /

now, install sudo by:

apt install sudo

check your sudo settings once again by:

visudo

also, check if your account gijs is a member of sudo
If not, add him as a member of sudo and wheel group by:

usermod -aG sudo gijs

usermod -aG wheel gijs

Now, you may restart and you now should have access to sudo.

This answer is abridged version of Jorge Castro's answer on How do I reset a lost administrative password?

share|improve this answer

edited 11 hours ago

answered 17 hours ago

Varun ChhanganiVarun Chhangani

12819

root@gijs-pc:~#

mount -o remount,rw /

apt install sudo

visudo

usermod -aG sudo gijs

usermod -aG wheel gijs

share|improve this answer

edited 11 hours ago

answered 17 hours ago

Varun ChhanganiVarun Chhangani

12819

answered 17 hours ago

Varun ChhanganiVarun Chhangani

12819

answered 17 hours ago

Varun ChhanganiVarun Chhangani

12819