Damaged file in /etc/sudoers.d (Solution)

[Persisto]

I did a complete re-install of Linux Mint 20.2.
I have my /home directory on a separate drive.
After the re-installing Jellyfin, sudo would not work anymore with the following message

EDIT: I had assumed this problem was due to what had remained of Jellyfin my /home directory.
However after uninstalling (sudo apt-get purge --auto-remove jellyfin ) and re-installing the problem re-appeared!!!
I'll avoid it as of now https://www.<blocked blogspam>/how-to-ins ... x-mint-20/
EDIT end.

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pete@pete-Z420-2-L:~$ sudo reboot now
>>> /etc/sudoers.d/jellyfin-sudoers: Alias "RESTARTSERVER_SYSV" already defined near line 2 <<<
>>> /etc/sudoers.d/jellyfin-sudoers: Alias "STARTSERVER_SYSV" already defined near line 3 <<<
>>> /etc/sudoers.d/jellyfin-sudoers: Alias "STOPSERVER_SYSV" already defined near line 4 <<<
>>> /etc/sudoers.d/jellyfin-sudoers: Alias "RESTARTSERVER_SYSTEMD" already defined near line 5 <<<
>>> /etc/sudoers.d/jellyfin-sudoers: Alias "STARTSERVER_SYSTEMD" already defined near line 6 <<<
>>> /etc/sudoers.d/jellyfin-sudoers: Alias "STOPSERVER_SYSTEMD" already defined near line 7 <<<
>>> /etc/sudoers.d/jellyfin-sudoers: Alias "RESTARTSERVER_INITD" already defined near line 8 <<<
>>> /etc/sudoers.d/jellyfin-sudoers: Alias "STARTSERVER_INITD" already defined near line 9 <<<
>>> /etc/sudoers.d/jellyfin-sudoers: Alias "STOPSERVER_INITD" already defined near line 10 <<<
sudo: parse error in /etc/sudoers.d/jellyfin-sudoers near line 2
sudo: no valid sudoers sources found, quitting...
sudo: unable to initialise policy plug-in

This showed the way https://askubuntu.com/questions/799669/ ... 17#1053617

In step 4, instead of of

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pkexec visudo

I entered

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pkexec visudo -f /etc/sudoers.d/jellyfin-sudoers

and saved an unchanged copy of the file in my home directory.

and then deleted the offending file

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pkexec rm /etc/sudoers.d/jellyfin-sudoers

All Ok!