The link https://wiki.ubuntu.com/Testing/EnableProposed talks about Ubuntu 14.04 and something called Softwatre & Updates:
"To enable the proposed archive for Ubuntu 14.04 use the Software & Updates program and ensure that Pre-release updates (trusty-proposed) is ticked in the Updates tab." Is "Software & Updates" the same thing as System Tools -> Administration -> Update Manager, or Software Updater? I got a crash when I tried to start Software Updater (it asked if I wanted to report it as a I relaunched it: but relaunching just crashed again). When I chose Update Manager, the window appeared then vanished. I've attached the excerpt from /var/syslog. I saw a warning a few days ago stating that one of my repositories for trusty (extensions, IIRC) was not able to be fetched as its signature was missing or out of date, and so I went into Update Manager and unchecked the single repository that matched. That sounds relevant, as I'm running Ubuntu 16.04. Also possibly relevant is a red danger- triangle that has been appearing on the top status/widget bar in the Flashback/Metacity UI, related to system updates: none of the options provided via the warning icon's drop-down menu actually worked (I think the options included: check for updates, install updates), but I was able to run Synaptic and Mark All Upgrade and then Apply and the red warning triangle went away following the updates synpatic found and applied. Ah, and starting synaptic now reports an error in a more friendly way: E: Encountered a section with no Package: header E: Problem with MergeList /var/lib/apt/lists/au.archive.ubuntu.com_ubuntu_dists_trusty-updates_main_i18n_Translation-en E: The package lists or status file could not be parsed or opened. E: _cache->open() failed, please report. I'll add another comment and attach that file, too: it looks binary to me. ** Attachment added: "Errors reported in /var/syslog" https://bugs.launchpad.net/ubuntu/+source/metacity/+bug/1573478/+attachment/4647667/+files/syslog-excerpt.txt -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to metacity in Ubuntu. https://bugs.launchpad.net/bugs/1573478 Title: metacity (flashback) crashes and forces logout Status in metacity package in Ubuntu: Confirmed Status in metacity source package in Xenial: Fix Committed Status in metacity source package in Yakkety: Confirmed Bug description: [Impact] Metacity can segfault in several cases. It is a regression introduced by 1:3.18.3-1ubuntu3 upload. [Test Case] The exact step to get this bug are unknown. Just using Metacity for some time may make it crashing. Perhaps doing more WM-related operations (like Alt+Tabbing) may speed up triggering it. [Regression Potential] This fix is tested by several users and seems to not have any regressions. ----------------------------------------------------------------------------- After an update 2 or 3 days ago, at random times mid-session, all window decorations vanish, then the desktop goes to black (just time/date stamp showing IIRC, as at a screen lock), and then I'm presented with a login screen again. I was logging in with Gnome Flashback. It's been happening several times a day, and it's infuriating. This time I've logged in with the "(Metacity)" option rather than the (Flashback)" option, and I'll see if that works. Otherwise, I'll go back to a Window Maker session to get a reliable experience. I see this in /var/log/kern.log: Apr 22 18:31:48 pute kernel: [11401.021438] perf interrupt took too long (2509 > 2500), lowering kernel.perf_event_max_sample_rate to 50000 Apr 22 18:32:33 pute kernel: [11445.589519] show_signal_msg: 66 callbacks suppressed Apr 22 18:32:33 pute kernel: [11445.589528] metacity[2447]: segfault at 1a3359 ip 0000000000426f51 sp 00007fff3ed289b8 error 4 in metacity[400000+8d000] Apr 22 18:32:33 pute gnome-session-binary[1845]: Unrecoverable failure in required component metacity.desktop Apr 22 18:32:47 pute gnome-session-binary[7282]: Entering running state Apr 22 18:33:37 pute gnome-session-binary[8527]: Entering running state Here are some earlier ones: Apr 22 15:18:47 pute kernel: [60617.177188] metacity[16270]: segfault at 48 ip 0000000000426e2e sp 00007fff2daf0478 error 4 in metacity[400000+8d000] Apr 22 15:18:47 pute gnome-session-binary[16198]: Unrecoverable failure in required component metacity.desktop Apr 22 15:18:58 pute gnome-session-binary[28521]: Entering running state Apr 22 15:21:11 pute NetworkManager[802]: <info> [1461302471.2831] ModemManager disappeared from bus Apr 22 15:21:52 pute kernel: [ 0.000000] Initializing cgroup subsys cpuset Apr 22 02:22:23 pute kernel: [14028.678785] show_signal_msg: 27 callbacks suppressed Apr 22 02:22:23 pute kernel: [14028.678797] metacity[2509]: segfault at 302e64617074 ip 0000000000466780 sp 00007ffca8b8b998 error 4 in metacity[400000+8d000] Apr 22 02:22:28 pute gnome-session-binary[2439]: Unrecoverable failure in required component metacity.desktop Apr 22 02:22:56 pute gnome-session-binary[9411]: Entering running state Apr 22 04:02:03 pute kernel: [20008.941872] metacity[9467]: segfault at 7f6e008e0018 ip 0000000000426e20 sp 00007ffc7090a3c8 error 4 in metacity[400000+8d000] Apr 22 04:02:03 pute gnome-session-binary[9411]: Unrecoverable failure in required component metacity.desktop Apr 22 04:02:23 pute gnome-session-binary[14247]: Entering running state Apr 22 04:15:57 pute kernel: [20843.181807] traps: metacity[14309] general protection ip:466530 sp:7ffd40cb18b8 error:0 in metacity[400000+8d000] Apr 22 04:15:57 pute gnome-session-binary[14247]: Unrecoverable failure in required component metacity.desktop Apr 22 04:15:57 pute kernel: [20843.493120] QXcbEventReader[15628]: segfault at 7ff10d5e7629 ip 00007ff10d5e7629 sp 00007ff0ff5a5d60 error 14 in libes_plugin.so[7ff10d697000+6000] Apr 22 04:16:16 pute gnome-session-binary[16198]: Entering running state Apr 21 22:25:24 pute kernel: [3148119.324731] metacity[2822]: segfault at 100000007 ip 00007f8020e83278 sp 00007ffdc421c010 error 4 in libc-2.21.so (deleted)[7f8020e04000+1c0000] Apr 21 22:25:24 pute gnome-session-binary[2714]: Unrecoverable failure in required component metacity.desktop Apr 21 22:25:24 pute kernel: [3148119.901802] dconf worker[2727]: segfault at 8 ip 00007f35f3db2481 sp 00007f35ea99baa0 error 4 in libglib-2.0.so.0.4706.0 (deleted)[7f35f3d6b000+10e000] Apr 21 22:25:29 pute kernel: [3148124.830996] dbus-daemon[2635]: segfault at 0 ip 00007f10b2934017 sp 00007ffff7b10518 error 6 in libdbus-1.so.3.14.6 (deleted)[7f10b2908000+4a000] Apr 21 22:25:55 pute gnome-session-binary[19038]: Entering running state Apr 21 22:26:28 pute gnome-session-binary[19038]: Entering running state Apr 21 22:26:28 pute kernel: [3148183.865201] metacity[19100]: segfault at 48 ip 0000000000426f51 sp 00007ffe2a345168 error 4 in metacity[400000+8d000] Apr 21 22:26:32 pute gnome-session-binary[19038]: Unrecoverable failure in required component metacity.desktop Apr 21 22:26:48 pute gnome-session-binary[20075]: Entering running state Apr 21 22:27:31 pute gnome-session-binary[20075]: Entering running state $ lsb_release -rd Description: Ubuntu 16.04 LTS Release: 16.04 $ apt-cache policy metacity metacity: Installed: 1:3.18.3-1ubuntu3 Candidate: 1:3.18.3-1ubuntu3 Version table: *** 1:3.18.3-1ubuntu3 500 500 http://mirror.optus.net/ubuntu xenial/main amd64 Packages 100 /var/lib/dpkg/status 1:2.34.13-0ubuntu4.1 500 500 http://au.archive.ubuntu.com/ubuntu trusty-updates/main amd64 Packages What I expected to happen: No spontaneous, forced logout. What happened instead: Repeated, random forced logouts. ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: metacity 1:3.18.3-1ubuntu3 ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6 Uname: Linux 4.4.0-21-generic x86_64 ApportVersion: 2.20.1-0ubuntu2 Architecture: amd64 CurrentDesktop: GNOME-Flashback:Unity Date: Fri Apr 22 18:44:02 2016 InstallationDate: Installed on 2014-01-24 (819 days ago) InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20140123) SourcePackage: metacity UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/metacity/+bug/1573478/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
