Bug#449040: Also provides no means to know what is going to be removed, even if you look

[John Winters]

Further to this issue, when update-manager offers you the option to
switch to "Smart upgrade" mode it says, "Be sure to check the proposed
removals for software you would like to keep installed." but nowhere
does it tell you what the proposed removals are, so you can't check them
whether you want to or not.  You have to exit update-manager and run a
different upgrade tool if you want to know details of what the problem is.