It doesn't seem like the screensaver really is properly disabled during upgrades, at least looking very naively at what happens during the upgrade -- if I go out of my way to disable it, I got the screen to completely freeze (but at least everything did not crash down to lightdm).
FWIW, I've managed to somewhat make sure the issues were in one of this set for upgrade: The following packages will be REMOVED: gnome-system-monitor libatkmm-1.6-1 libcairomm-1.0-1 libglibmm-2.4-1c2a libgtkmm-3.0-1 libmetacity-private0a libpangomm-1.4-1 libsigc++-2.0-0c2a overlay-scrollbar-gtk3 The following NEW packages will be installed: adwaita-icon-theme gcc-5-base jayatana libappstream-glib8 libboost-filesystem1.58.0 libboost-system1.58.0 libcolord2 libgcab-1.0-0 libgcrypt20 libglew1.13 libglewmx1.13 libglibmm-2.4-1v5 libgnome-desktop-3-12 libgtop-2.0-10 libmetacity-private3a libmirclient9 libmircommon5 libmirprotobuf3 libprotobuf-lite9v5 libprotobuf9v5 libsigc++-2.0-0v5 libsystemd0 libyaml-0-2 session-shortcuts unity-schemas The following packages will be upgraded: bamfdaemon compiz-core compiz-gnome compiz-plugins-default fontconfig-config gnome-accessibility-themes gnome-desktop3-data indicator-appmenu libatk1.0-0 libatk1.0-data libbamf3-2 libcairo2 libcompizconfig0 libdecoration0 libfontconfig1 libgail-3-0 libgpg-error0 libgtk-3-0 libgtk-3-common libgtop2-common libharfbuzz0b liblcms2-2 libnux-4.0-0 libnux-4.0-common libpango-1.0-0 libpango1.0-0 libpangocairo-1.0-0 libpangoft2-1.0-0 libpangoxft-1.0-0 libsoup2.4-1 libstdc++6 libunity-core-6.0-9 libunity-protocol-private0 libunity9 libwayland-client0 libwayland-cursor0 libxkbcommon0 libxrandr2 metacity-common overlay-scrollbar ubuntu-desktop unity unity-services 43 upgraded, 25 newly installed, 9 to remove and 1262 not upgraded. Need to get 17.9 MB of archives. After this operation, 12.2 MB of additional disk space will be used. It certainly still points to an issue in compiz and needs further debugging, but I'll let Eleni deal with it and focus on the screensaver bits in u-r-u, at least to make sure it does disable the screensaver correctly and that I was just mistaken. ** Description changed: STEPS: 1. Install 14.04.4 on a uefi securebooted system 2. update it 3. Install openssh-server for debug access 4. reboot 5. Hit alt+f2 6. Type update-manager -d and hit enter EXPECTED: I expected a smooth transition to 16.04 ACTUAL: System is completely taken out mid way through the process killing the session and x also no tty when hitting ctrl+alt+f1-6 --- TESTS RESULTS (from cyphermox): On amd64 (no EFI) under qemu/libvirt, qxl graphics: - upgrading just libglib2.0-0 from 16.04 on top of 14.04.4: PASS - upgrading ubuntu-desktop (running gnome-shell) 14.04.4 to 16.04: PASS - upgrading ubuntu-desktop (running xubuntu-session) 14.04.4 to 16.04: PASS - manually upgrading compiz and other packages to 16.04 versions; after adding xenial sources: - compiz and related packages (http://paste.ubuntu.com/15415280/) : PASS - xserver-xorg and related: PASS - unity and related: PASS - ubuntu-desktop: PASS - libgl1-mesa-dri: PASS - apt-get dist-upgrade: FAIL (screensaver may have kicked in) - - standard upgrading 14.04.4 to 16.04; screensaver disabled: INPROGRESS - - re-enabling screensaver after upgrade, before reboot: TODO + - standard upgrading 14.04.4 to 16.04; screensaver disabled: FAIL (looked fine, but upgrade eventually froze, might well be a different issue) + - re-enabling screensaver after upgrade, before reboot: TODO (above failed) On ppc64el: - upgrading ubuntu-server 14.04.4 -> 16.04: PASS --- ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: ubuntu-release-upgrader-core 1:0.220.8 ProcVersionSignature: Ubuntu 4.2.0-30.36~14.04.1-generic 4.2.8-ckt3 Uname: Linux 4.2.0-30-generic x86_64 ApportVersion: 2.14.1-0ubuntu3.19 Architecture: amd64 CrashDB: ubuntu Date: Wed Mar 9 17:01:27 2016 InstallationDate: Installed on 2016-03-04 (5 days ago) InstallationMedia: Ubuntu 14.04.4 LTS "Trusty Tahr" - Beta amd64 (20160224) PackageArchitecture: all SourcePackage: ubuntu-release-upgrader Symptom: ubuntu-release-upgrader UpgradeStatus: Upgraded to xenial on 2016-03-09 (0 days ago) VarLogDistupgradeTermlog: -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1555237 Title: Upgrade from 14.04.4→ 16.04 dies midway taking out the session. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/compiz/+bug/1555237/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
