Public bug reported: Preliminary note: I can't reproduce it anymore since 11th October 2018. Was hitting it in my VM 100% beforehand though. The VM was set at 1Gb (default Boxes value at the time), so maybe hitting OOM killing too hard. I can't dist-upgrade anymore with 1Gb of memory (VM hangs) anymore, so could be that or package installation order.
This is why the proposed patch is just posted right now, but not applied. ---- On bionic, run do-release-upgrade At 2/3 of the installation, you will see icons disappearing from the dock and the system Shell menu, blue background, menu entries missing… (see attached picture). After reboot, on cosmic, you end up with Yaru theme. The issue is only during/after the dist-upgrade upon reboot. -> Restarting the Shell loads the default Shell theme (not Yaru) as we address now an ubuntu.css file which doesn't exists. All icons, theme, and menu entries are restored. I have attached a potential patch which triggerts the Shell restart in ubuntu-release-upgrader (before obsolete package cleanup) as a Quirk (Xorg-only), which is tested. However, as of today I can't reproduce this issue and unsure if this one was due to low memory or package ordering, I wonder if it worths pushing this patch. It seems conscensus on #ubuntu-desktop is to wait and see. ProblemType: Bug DistroRelease: Ubuntu 18.10 Package: ubuntu-release-upgrader-core 1:18.10.10 ProcVersionSignature: Ubuntu 4.18.0-8.9-generic 4.18.7 Uname: Linux 4.18.0-8-generic x86_64 NonfreeKernelModules: nvidia_modeset nvidia ApportVersion: 2.20.10-0ubuntu11 Architecture: amd64 CrashDB: ubuntu CurrentDesktop: ubuntu:GNOME Date: Thu Oct 11 11:56:25 2018 InstallationDate: Installed on 2018-05-24 (139 days ago) InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426) PackageArchitecture: all ProcEnviron: TERM=xterm-256color PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=fr_FR.UTF-8 SHELL=/bin/bash SourcePackage: ubuntu-release-upgrader Symptom: ubuntu-release-upgrader UpgradeStatus: No upgrade log present (probably fresh install) ** Affects: ubuntu-release-upgrader (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug cosmic dist-upgrade ** Attachment added: "Screenshot from 2018-10-03 18-08-49.png" https://bugs.launchpad.net/bugs/1797353/+attachment/5199934/+files/Screenshot%20from%202018-10-03%2018-08-49.png -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1797353 Title: bionic -> cosmic dist-upgrade ends up with graphical Shell artefacts To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1797353/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs