[Bug 1422345] Re: stop being nice does not work

[Adolfo Jayme]

** Tags added: regression-release

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Title:
  stop being nice does not work

Status in unattended-upgrades package in Ubuntu:
  New

Bug description:
  Since version 0.81, unattended-upgrades does the upgrade calculation with os.nice(19). To finish the nice block in /usr/bin/unattended-upgrade, the following call is used:
  os.nice(0)

  Since the argument is interpreted as incremental, this should be:
  os.nice(-19)

  Without this fix, this problem is back:
  https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=701850
  "unattended-upgrades: nice 19/ionice idle inherited by restarted processes"

  Found in the trusty version (0.82.1ubuntu2), but probably in any
  version (including Debian) since 0.81.

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