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I managed to borde my sudo... I have a backup of the system that I can try restore. However, since sudo is broken I can't overwrite files that are protected.

Guidelines I tired to follow when making and restoring the backup: https://help.ubuntu.com/community/BackupYourSystem/TAR

Basically I want to run

sudo tar -xvpzf /path/to/backup.tar.gz -C / --numeric-owner

Which generates:

sudo: /usr/bin/sudo must be owned by uid 0 and have the setuid bit set

Any suggestions?

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  • You can't resore a full system backup this way. You need to boot from a LiveUSB. – Pilot6 Feb 8 '20 at 10:19
  • Can you boot to runlevel 1? Do you have another account with sudo privilieges, or root account enabled? Otherwise I'd boot a 'live' system & fix the issue (which I take it is you didn't use visudo which evaluates any changes before exiting your chosen editor). – guiverc Feb 8 '20 at 10:19
  • Most likely OP ran something like chmod 777 -R / – Pilot6 Feb 8 '20 at 10:24
  • @Pilot6 yep, chown user1:user1 -R / RIP – Jesper.Lindberg Feb 8 '20 at 10:31
  • Why so many people shoot in their foot? – Pilot6 Feb 8 '20 at 10:33
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Generally you can't restore a full-system backup from within a broken system. Especially when sudo is broken.

Yoг need to boot from something else, like Ubuntu LiveUSB. Then you'll be able to restore.

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