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How can I install sudo without using su?

How do I reset a lost administrative password?Can sudo be reinstalled after being removed?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?

1

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 1 hour ago

Kulfy

4,79651743

asked 1 hour ago

Gijs ClaesGijs Claes

61

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.

• 
  
  
  

  
  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
  1 hour ago
  

  
  
  
  


• 
  
  
  

  
  3
  

  
  
  
  
  
  

  
  
  Possible duplicate of Can sudo be reinstalled after being removed?
  
  – Olorin
  46 mins ago
  

  
  
  
  

add a comment | 

1

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 1 hour ago

Kulfy

4,79651743

asked 1 hour ago

Gijs ClaesGijs Claes

61

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.

• 
  
  
  

  
  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
  1 hour ago
  

  
  
  
  


• 
  
  
  

  
  3
  

  
  
  
  
  
  

  
  
  Possible duplicate of Can sudo be reinstalled after being removed?
  
  – Olorin
  46 mins ago
  

  
  
  
  

add a comment | 

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 1 hour ago

Kulfy

4,79651743

asked 1 hour ago

Gijs ClaesGijs Claes

61

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 1 hour ago

Kulfy

4,79651743

asked 1 hour ago

Gijs ClaesGijs Claes

61

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 1 hour ago

Kulfy

4,79651743

asked 1 hour ago

Gijs ClaesGijs Claes

61

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 1 hour ago

Kulfy

4,79651743

edited 1 hour ago

Kulfy

4,79651743

asked 1 hour ago

Gijs ClaesGijs Claes

61

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 1 hour ago

Gijs ClaesGijs Claes

61

1 Answer
1

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5

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 group by:

usermod -aG sudo 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 58 mins ago

answered 1 hour ago

Varun ChhanganiVarun Chhangani

6818

• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  Maybe you should enable network before dropping to root shell !!
  
  – Soren A
  1 hour ago
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @SorenA sorry and thanks. Changed it
  
  – Varun Chhangani
  1 hour ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

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

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  Hey @EODCraftStaff, while I respect your opinion but IMHO it is very unwise to not to upvote an answer just because it is a well explained version of what other user has commented. Comments could be deleted for many reasons and mikewhatever (I think) has assumed that OP knows how to get into Grub menu and then recovery mode and ... Also it is very unwise to not to upvote an answer just because the question is duplicate. I've seen many a times answers on duplicate get more votes than the answers on original one. Neither the question is too bad nor the answer.
  
  – Kulfy
  29 mins ago
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  @EODCraftStaff At the end, vote is yours, you have your own opinions and views to cast it or not. I just shared my opinions as well :)
  
  – Kulfy
  29 mins ago
  
  
  

  
  
  
  

 | 
show 2 more comments

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5

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 group by:

usermod -aG sudo 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 58 mins ago

answered 1 hour ago

Varun ChhanganiVarun Chhangani

6818

• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  Maybe you should enable network before dropping to root shell !!
  
  – Soren A
  1 hour ago
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @SorenA sorry and thanks. Changed it
  
  – Varun Chhangani
  1 hour ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

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

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  Hey @EODCraftStaff, while I respect your opinion but IMHO it is very unwise to not to upvote an answer just because it is a well explained version of what other user has commented. Comments could be deleted for many reasons and mikewhatever (I think) has assumed that OP knows how to get into Grub menu and then recovery mode and ... Also it is very unwise to not to upvote an answer just because the question is duplicate. I've seen many a times answers on duplicate get more votes than the answers on original one. Neither the question is too bad nor the answer.
  
  – Kulfy
  29 mins ago
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  @EODCraftStaff At the end, vote is yours, you have your own opinions and views to cast it or not. I just shared my opinions as well :)
  
  – Kulfy
  29 mins ago
  
  
  

  
  
  
  

 | 
show 2 more comments

5

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 group by:

usermod -aG sudo 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 58 mins ago

answered 1 hour ago

Varun ChhanganiVarun Chhangani

6818

• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  Maybe you should enable network before dropping to root shell !!
  
  – Soren A
  1 hour ago
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @SorenA sorry and thanks. Changed it
  
  – Varun Chhangani
  1 hour ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

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

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  Hey @EODCraftStaff, while I respect your opinion but IMHO it is very unwise to not to upvote an answer just because it is a well explained version of what other user has commented. Comments could be deleted for many reasons and mikewhatever (I think) has assumed that OP knows how to get into Grub menu and then recovery mode and ... Also it is very unwise to not to upvote an answer just because the question is duplicate. I've seen many a times answers on duplicate get more votes than the answers on original one. Neither the question is too bad nor the answer.
  
  – Kulfy
  29 mins ago
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  @EODCraftStaff At the end, vote is yours, you have your own opinions and views to cast it or not. I just shared my opinions as well :)
  
  – Kulfy
  29 mins ago
  
  
  

  
  
  
  

 | 
show 2 more comments

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 group by:

usermod -aG sudo 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 58 mins ago

answered 1 hour ago

Varun ChhanganiVarun Chhangani

6818

root@gijs-pc:~#

mount -o remount,rw /

apt install sudo

visudo

usermod -aG sudo gijs

share|improve this answer

edited 58 mins ago

answered 1 hour ago

Varun ChhanganiVarun Chhangani

6818

answered 1 hour ago

Varun ChhanganiVarun Chhangani

6818

answered 1 hour ago

Varun ChhanganiVarun Chhangani

6818