Olivier, this worked for me. The file which was removed was

~/.thunderbird/2nss1yxl.default/extensions/langpack-en-
g...@thunderbird.mozilla.org.xpi

Strangely, when I open Add-Ons in the newly-working Thunderbird, I still see
English (CA), English (GB) and Français (all marked "Can't be removed").

$ dpkg -l | grep thunderbird
thunderbird                                   1:78.3.2+build1-0ubuntu1          
                  
thunderbird-gnome-support                     1:78.3.2+build1-0ubuntu1          
                  
thunderbird-locale-en                         1:78.3.2+build1-0ubuntu1          
                  
thunderbird-locale-en-us                      1:78.3.2+build1-0ubuntu1          
                  
thunderbird-locale-fr                         1:78.3.2+build1-0ubuntu1          
               

As for Andrés, it still worked straight after the upgrade to 20.10, and
stopped working yesterday.

Cheers
John

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to thunderbird in Ubuntu.
https://bugs.launchpad.net/bugs/1901829

Title:
  thunderbird fails to open, xml parse error

Status in thunderbird package in Ubuntu:
  Confirmed

Bug description:
  launching thunderbird opens a small browser window displaying the
  following error:

  XML Parsing Error: undefined entity
  Location: chrome://messenger/content/messenger.xhtml
  Line Number 905, Column 3:
    <key id="openLightningKey"
  --^

  when launched from the command line, the following errors appear:

  [calBackendLoader] Using Thunderbird's libical backend
  Extension error: Error while loading 
'jar:file:///usr/lib/thunderbird/extensions/messagingm...@mozilla.com.xpi!/manifest.json'
 (NS_ERROR_FILE_NOT_FOUND) resource://gre/modules/Extension.jsm:570 :: 
readJSON/</<@resource://gre/modules/Extension.jsm:570:20
  onStopRequest@resource://gre/modules/NetUtil.jsm:128:18

  Extension error: Error while loading 
'jar:file:///usr/lib/thunderbird/omni.ja!/chrome/messenger/search-extensions/twitter/manifest.json'
 (NS_ERROR_FILE_NOT_FOUND) resource://gre/modules/Extension.jsm:570 :: 
readJSON/</<@resource://gre/modules/Extension.jsm:570:20
  onStopRequest@resource://gre/modules/NetUtil.jsm:128:18

  from desktop GUI it is possible to launch "Compose new message" or "Contacts" 
window,
  then in "Help" menu select "Restart with add-ons disabled", then the normal 
mail/calendar
  window opens and functions normally

  cheers

  ProblemType: Bug
  DistroRelease: Ubuntu 20.10
  Package: thunderbird 1:78.3.2+build1-0ubuntu1
  ProcVersionSignature: Ubuntu 5.8.0-25.26-generic 5.8.14
  Uname: Linux 5.8.0-25-generic x86_64
  AddonCompatCheckDisabled: False
  ApportVersion: 2.20.11-0ubuntu50
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  frankland   7570 F.... pulseaudio
   /dev/snd/controlC1:  frankland   7570 F.... pulseaudio
  BuildID: 20201006011220
  CasperMD5CheckResult: skip
  Channel: Unavailable
  CurrentDesktop: ubuntu:GNOME
  Date: Wed Oct 28 10:05:04 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 2018-03-28 (945 days ago)
  InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20180105.1)
  IpRoute:
   default via 193.48.109.1 dev enx9cebe86f11b0 proto dhcp metric 100 
   default via 193.48.109.1 dev wlp1s0 proto dhcp metric 600 
   169.254.0.0/16 dev enx9cebe86f11b0 scope link metric 1000 
   193.48.109.0/24 dev enx9cebe86f11b0 proto kernel scope link src 
193.48.109.26 metric 100 
   193.48.109.0/24 dev wlp1s0 proto kernel scope link src 193.48.109.26 metric 
600
  Locales: extensions.sqlite corrupt or missing
  PrefErrors: Unexpected character ',' before close parenthesis @ 
/usr/lib/thunderbird/omni.ja:greprefs.js:732
  PrefSources: prefs.js
  Profiles: Profile0 (Default) - LastVersion=78.3.2/20201006011220 (In use)
  RunningIncompatibleAddons: False
  SourcePackage: thunderbird
  Themes: extensions.sqlite corrupt or missing
  UpgradeStatus: Upgraded to groovy on 2020-10-23 (4 days ago)
  dmi.bios.date: 01/07/2020
  dmi.bios.release: 1.17
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 1.17.1
  dmi.board.name: 0DW6V0
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 10
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: 
dmi:bvnDellInc.:bvr1.17.1:bd01/07/2020:br1.17:svnDellInc.:pnLatitude5580:pvr:rvnDellInc.:rn0DW6V0:rvrA00:cvnDellInc.:ct10:cvr:
  dmi.product.family: Latitude
  dmi.product.name: Latitude 5580
  dmi.product.sku: 07D1
  dmi.sys.vendor: Dell Inc.

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