I have a set of Ubuntu VMs which I'm setting up Update Management on. The first VM took 2 runs to get it fully up to date, but the 2nd was a real problem.
It errored after 20 or so updates, leaving 80 not installed. New runs would simply not install anything. After looking at the logs and manually running the first erroring package command, the error message said to run "sudo dpkg --configure -a". This then 'unblocked' the broken package, and running the updates again allows some through, but only until the next one broke.
Following the same process indicated that the same manual fix was required.
Is this the normal procedure for Linux Update Management?