Public bug reported:

After upgrading sudo from 1.9.4p2-2ubuntu3 to 1.9.5p2-2ubuntu1, it no
longer works.

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

The file permission of /usr/bin/sudo seems to have been messed up.

$ ls -l /usr/bin/sudo
-rwsr-xr-x 1 2001 2501 190952 2021-02-10 19:42 /usr/bin/sudo

System information:

$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu Hirsute Hippo (development branch)
Release:        21.04
Codename:       hirsute

** Affects: sudo (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: block-proposed

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https://bugs.launchpad.net/bugs/1915789

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

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