Originally Posted by ishipaco
...or info on what happens to older software during an upgrade...
An upgrade, not a fresh install of the OS? You would have thought that if the software was available for the new version, it would be installed automatically, although that cannot be relied on, what with packages changing in name, and so on.
In the case of an rpm system, I'd do something like an 'rpm -qa > packages', but you are on a deb system. This
suggests that the equivalent is 'dpkg -l' (and redirect the output somewhere that it is bound to be caught by your pre-install backup...of course, you do do a pre-install backup, don't you?).
you could try to script a re-install of the missing packages, but you may well fall over the same problems that caused problems with the upgrade in the first place, so I'd suggest getting the list and using it as a 'clues list' for stuff that you would expect to find in your new install, so that you can try to manually install (or decide not to install) stuff.