[Merge] ~3v1n0/nux:preinst-conffiles-restore-xenial into nux:ubuntu/xenial

[Marco Trevisan (Treviño)]

Marco Trevisan (Treviño) has proposed merging ~3v1n0/nux:preinst-conffiles-restore-xenial into nux:ubuntu/xenial.

Commit message:
debian/nux-tools.preinst: restore backup config files

These might be moved by x11-common.

LP: #1768610

Requested reviews:
  Unity Team (unity-team)
Related bugs:
  Bug #1768610 in nux (Ubuntu): "leftover conffile forces GNOME is software rendering"
  https://bugs.launchpad.net/ubuntu/+source/nux/+bug/1768610

For more details, see:
https://code.launchpad.net/~3v1n0/nux/+git/nux/+merge/348390
-- 
Your team Unity Team is requested to review the proposed merge of ~3v1n0/nux:preinst-conffiles-restore-xenial into nux:ubuntu/xenial.
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