Upgrade to 18.0.30 - exit code 255 for most plesk console commands

I initiated the upgrade from 18.0.29 => 18.0.30. Once it finished, I was no longer able to access the panel. Most of the plesk command-line fails with an 'exit code 255', including:

plesk login
plesk repair installation -y

I tried fixing the PleskSQLServer using this article: Plesk SQL server does not start: exit status 255 to no avail. I also tried using the...

Upgrade to 18.0.30 - exit code 255 for most plesk console commands