Domoticz

Perhaps not the right place to ask, but rather desparate .....

After a failed installation of PHP on a 'naked' Raspberry (with Buster as O.S.), no longer able to run scripts applying sudo as enabler,
including the basic sudo reboot.

'Obviously' also some 'production' running on this Raspberry, and therefore very much desired to find an effective clean-up .....

Example Access is possible by means of Putty_SSH and WinSCP.
Scripts etc. have been saved elsewhere.

Any hint for repair (other than fresh reinstall)?

Why not use a more recent OS compared to Buster (which is EOL).

Besides that, check the 'chmod' settings of the sudoers file, as the error messages suggests.

I would just restart again from scratch but then with a more recent OS....

I think your /etc/sudoers file is wrong, so you need to check its content and change its security settings.

Certainly /etc/sudoers/ and it's contents is not correct, but situation is chicken-and-egg:
for the suggested change to attributes of the files in that folder it is necessary to apply sudo, but that is not available ......

Fortunately could copy/shift the 'production'-scripts to another, healthy Raspberry,
enabling to completely clean & refresh & update the victim-Raspberry without functional loss ........

Pragmatic solution => no further braincracking trying to 'repair' the victim-Raspberry.
Only have to find a way for installation of PHP without another 'accident' .....

Can't you just mount the sdcard or ssd drive that contains the /etc/sudoers file to another system and edit the file.