Firefox fails to start - says it is already running

[Raphael Mankin]

I have just run update-manager (29Apr2020) and restarted the laptop. On restart I get the message 'firefox is already running'. I disabled the apparmor profile for usr.bin.firefox and usr.lib.firefox.firefox and could then run firefox.

Ubuntu-bug says that I have modified the apparmor profile, but while I have written new profiles for skype and zoom, I have not touched any pre-installed profiles.

So a firefox bug, or an apparmor bug?

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: firefox 75.0+build3-0ubuntu0.18.04.1
ProcVersionSignature: Ubuntu 4.15.0-99.100-generic 4.15.18
Uname: Linux 4.15.0-99-generic x86_64
AddonCompatCheckDisabled: False
ApportVersion: 2.20.9-0ubuntu7.14
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC1: raph 3525 F.... pulseaudio
 /dev/snd/controlC0: raph 3525 F.... pulseaudio
BuildID: 20200403170909
Channel: Unavailable
CurrentDesktop: XFCE
Date: Wed Apr 29 09:46:51 2020
Extensions: extensions.sqlite corrupt or missing
ForcedLayersAccel: False
IfupdownConfig:
 # interfaces(5) file used by ifup(8) and ifdown(8)
 auto lo
 iface lo inet loopback
IncompatibleExtensions: Unavailable (corrupt or non-existant compatibility.ini or extensions.sqlite)
InstallationDate: Installed on 2018-02-09 (809 days ago)
InstallationMedia: Xubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
Locales: extensions.sqlite corrupt or missing
PrefErrors: Unexpected character ',' before close parenthesis @ /usr/lib/firefox/omni.ja:greprefs.js:736
PrefSources: prefs.js
Profiles: Profile0 (Default) - LastVersion=75.0/20200403170909 (In use)
RunningIncompatibleAddons: False
SourcePackage: firefox
Themes: extensions.sqlite corrupt or missing
UpgradeStatus: Upgraded to bionic on 2018-09-12 (594 days ago)
dmi.bios.date: 09/13/2017
dmi.bios.vendor: LENOVO
dmi.bios.version: N11ET42W (1.18 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20CJS0UU00
dmi.board.vendor: LENOVO
dmi.board.version: SDK0E50510 WIN
dmi.chassis.asset.tag: R90G3N7R
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.modalias: dmi:bvnLENOVO:bvrN11ET42W(1.18):bd09/13/2017:svnLENOVO:pn20CJS0UU00:pvrThinkPadT550:rvnLENOVO:rn20CJS0UU00:rvrSDK0E50510WIN:cvnLENOVO:ct10:cvrNone:
dmi.product.family: ThinkPad T550
dmi.product.name: 20CJS0UU00
dmi.product.version: ThinkPad T550
dmi.sys.vendor: LENOVO
mtime.conffile..etc.apparmor.d.usr.bin.firefox: 2020-04-25T20:51:24.045158

[Raphael Mankin (raph-p)]

Adding apparmor log

[Raphael Mankin (raph-p)]

After another update today (30Apr2020) and another run of update-manager the problem appears to be gone.

[Olivier Tilloy (osomon)]

Glad to read that the problem is gone. Thanks for following up, and don't hesitate to re-open the bug if it happens again.