[Bug 1264887] Re: After upgrade 12.04 -> 14.04 there was no display manager (kdm or lightdm)

[Harald Sitter]

Well, random guess of the day: lightdm was not installed during the
upgrade because kubuntu-desktop was not present (thus no dependency tie
to lightm) and kdm was removed in the post-upgrade cleanup either
because there were no dependency chains to in anymore or there is
special magic that marked kdm for removal (probably latter I am
guessing).

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Title:
  After upgrade 12.04 -> 14.04 there was no display manager (kdm or
  lightdm)

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