Ubuntu Server 18.04 sudo command not working?

Question

ubuntu

Help me mess something up with any sudo command
error
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sudo: unable to stat /etc/sudoers: Permission denied
sudo: no valid sudoers sources found, quitting
sudo: unable to initialize policy plugin

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As a result, the server has fallen who can really help
rights
-r--r----- 1 root root 755 Jan 18 2018 sudoers
dr--r----- 2 root root 4096 Jun 5 10:53 sudoers.d
-r--r----- 1 root root 958 Feb 2 2020 /etc/sudoers.d/README
booted from LIVE DISK

Answer 1

And what is not clear here?
sudo: unable to stat /etc/sudoers: Permission denied
repair permissions on the file and touch it with your hands. he should never have
rights 0440 (root / root)

Answer 2

Add your user to the /etc/sudoers file, similar to the entries already there. Don't forget to log in as root to have access to the file.