comment out the lines with PHP72 and PHP73, those are not supported anymore and somebody apparently reorganized the autoinstall plesk server on Aug 17 (for php72) and September 8 (for php73), removing the jessie distfiles and breaking the plesk scripts in the process. That somebody should be ashamed of themselves for making things harder than necessary.
After running the pre stage - which wants to ensure that the system is as up to date as jessie can be - put those lines back in, changing jessie to stretch.
BTW, are you really on Plesk Onyx?
After running the pre stage - which wants to ensure that the system is as up to date as jessie can be - put those lines back in, changing jessie to stretch.
BTW, are you really on Plesk Onyx?