[Bug 1783593] Re: UI frozen and no information when the upgrader is installing snap packages

[Brian Murray]

I tested a release upgrade from Ubuntu 16.04 to Ubuntu 18.04 today using
the dist-upgrader from -proposed. Because its not possible to use do-
release-upgrade -d and -p, I manually downloaded and extracted the dist-
upgrader tarball and ran 'sudo ./bionic --frontend DistUpgradeViewGtk3'.
This was on a virtual machine with 4 GB of memory. The process of
installing snaps was displayed on the screen during the upgrade process,
however the dist-upgrader dialog did freeze a couple of times perhaps
because of the low memory. Regardless this is an improvement over the
original situation and may be good enough.

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https://bugs.launchpad.net/bugs/1783593

Title:
  UI frozen and no information when the upgrader is installing snap
  packages

Status in ubuntu-release-upgrader package in Ubuntu:
  Fix Released
Status in ubuntu-release-upgrader source package in Bionic:
  Fix Committed

Bug description:
  Test Case
  1. Upgrade from Xenial to Bionic with update-manager -d

  Result
  At some point, after the deb packages have been upgraded, the UI freezes completely (cf Screenshot) for several minutes (6 minutes on my test system from a default xenial installation without any snap installed) seemingly doing nothing while the upgrader is installing snap packages.

  It should at least inform the user that snap packages are being
  installed, ideally with the currently running action like for debs.

  Additionally, if the machine being upgraded loses network connectivity
  at this stage, it hangs there forever and the only way out is to
  manually abort the ongoing snap change.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.10
  Package: ubuntu-release-upgrader-core 1:18.10.5
  ProcVersionSignature: Ubuntu 4.15.0-23.25-generic 4.15.18
  Uname: Linux 4.15.0-23-generic x86_64
  ApportVersion: 2.20.10-0ubuntu7
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Wed Jul 25 17:13:13 2018
  InstallationDate: Installed on 2014-07-15 (1471 days ago)
  InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Alpha amd64 (20140520)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  Symptom: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to cosmic on 2018-03-24 (123 days ago)

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