Did the upgrade succeed after killing that dialog? Can you try reinstalling the firefox package and share the output here?
sudo apt reinstall firefox ** Changed in: firefox (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to firefox in Ubuntu. https://bugs.launchpad.net/bugs/1975642 Title: package firefox 100.0.2+build1-0ubuntu0.21.10.1 failed to install/upgrade: new firefox package pre-installation script subprocess was killed by signal (Killed) Status in firefox package in Ubuntu: Incomplete Bug description: The 'frontend' informing dialog about migration to Firefox snap froze, had to kill it to resume upgrade to 22.04 ProblemType: Package DistroRelease: Ubuntu 22.04 ProcVersionSignature: Ubuntu 5.13.0-44.49-generic 5.13.19 Uname: Linux 5.13.0-44-generic x86_64 NonfreeKernelModules: bbswitch AddonCompatCheckDisabled: False ApportVersion: 2.20.11-0ubuntu82.1 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: sven 1645 F.... pulseaudio BuildID: 20220519220738 CasperMD5CheckResult: unknown Channel: Unavailable Date: Tue May 24 22:26:25 2022 ErrorMessage: new firefox package pre-installation script subprocess was killed by signal (Killed) ForcedLayersAccel: False InstallationDate: Installed on 2019-10-03 (964 days ago) InstallationMedia: Ubuntu 19.10 "Eoan Ermine" - Alpha amd64 (20190923) IpRoute: default via 192.168.178.1 dev wlp60s0 proto dhcp metric 600 169.254.0.0/16 dev docker0 scope link metric 1000 linkdown 172.17.0.0/16 dev docker0 proto kernel scope link src 172.17.0.1 linkdown 192.168.178.0/24 dev wlp60s0 proto kernel scope link src 192.168.178.20 metric 600 NoProfiles: True PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon. Python3Details: /usr/bin/python3.10, Python 3.10.4, python3-minimal, 3.10.4-0ubuntu2 PythonDetails: /usr/bin/python2.7, Python 2.7.18, python-is-python2, 2.7.18-9 RebootRequiredPkgs: Error: path contained symlinks. RelatedPackageVersions: dpkg 1.21.1ubuntu2 apt 2.4.5 RunningIncompatibleAddons: False Snap: firefox 100.0.2-1 (stable) Snap.Changes: ID Status Spawn Ready Summary 2 Done 2022-05-24T22:19:34+02:00 2022-05-24T22:29:56+02:00 Install "firefox" snap Title: package firefox 100.0.2+build1-0ubuntu0.21.10.1 failed to install/upgrade: new firefox package pre-installation script subprocess was killed by signal (Killed) UpgradeStatus: Upgraded to jammy on 2022-05-24 (0 days ago) dmi.bios.date: 03/15/2019 dmi.bios.release: 1.28 dmi.bios.vendor: HUAWEI dmi.bios.version: 1.28 dmi.board.name: MACH-WX9-PCB dmi.board.vendor: HUAWEI dmi.board.version: M1A dmi.chassis.type: 10 dmi.chassis.vendor: HUAWEI dmi.chassis.version: M1A dmi.ec.firmware.release: 1.28 dmi.modalias: dmi:bvnHUAWEI:bvr1.28:bd03/15/2019:br1.28:efr1.28:svnHUAWEI:pnMACH-WX9:pvrM1A:rvnHUAWEI:rnMACH-WX9-PCB:rvrM1A:cvnHUAWEI:ct10:cvrM1A:skuC100: dmi.product.family: MateBook X dmi.product.name: MACH-WX9 dmi.product.sku: C100 dmi.product.version: M1A dmi.sys.vendor: HUAWEI modified.conffile..etc.firefox.syspref.js: [deleted] To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1975642/+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