Trying the upgrade to 24.04 today, but it bails out before downloading with the following error:
An unresolvable problem occurred while calculating the upgrade.
The package 'ubuntu-minimal' is marked for removal but it is in the
removal deny list.
If none of this applies, then please report this bug using the
command 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal. If
you want to investigate this yourself the log files in
'/var/log/dist-upgrade' will contain details about the upgrade.
Specifically, look at 'main.log' and 'apt.log'.
Launchpad bug 2084268 (can’t post links apparently?) seems to suggest that this is likely an issue with having PPAs enabled (and other posts on the forum seem to back that up).
Forgot to attach my apt.log last night, but I do have some packages from the deadsnakes PPA installed plus some print drivers that might be causing problems. Will fiddle tonight and see where I get to.