[Merge] lp:~flocculant/update-manager/update-manager into lp:update-manager

[flocculant]

flocculant has proposed merging lp:~flocculant/update-manager/update-manager into lp:update-manager.

Requested reviews:
  Ubuntu Core Development Team (ubuntu-core-dev)

For more details, see:
https://code.launchpad.net/~flocculant/update-manager/update-manager/+merge/307449

Fix Update Manager crash on Xubuntu
-- 
Your team Ubuntu Core Development Team is requested to review the proposed merge of lp:~flocculant/update-manager/update-manager into lp:update-manager.
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