MXBoot & MX Package Installer are not working

[Huckleberry Finn]

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sudo apt update ; sudo apt reinstall mx-tools -y

[OskarMX]

Ok, then something's missing/broken regarding permissions/ownerships.

OK I think that I have identified the problem, thanks to your comments.... Few weeks ago I modified the pkexec permissions to 0755, in order to close the door to an active Exploit (Exploit CVE-2021-4034), and that has also messed up my system. Obvious I suppose.

Do you know what the usual (previous) pkexec permissions should be? I've tried Chmod 755 but is not working either....

Thanks in advance.

[Huckleberry Finn]

... modified the pkexec permissions to 0755...

Ok, but how did you do that or what (and where) did you do exactly?

In all cases you can (furthermore: do) apply the above command.

[fehlix]

Do you know what the usual (previous) pkexec permissions should be? I've tried Chmod 755 but is not working either....

You have removed the set-uid-bit and by this fixed the exploit by making pkexec not working as intended
To give it back this missing bit try:

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sudo chmod 4755 /usr/bin/pkexec