The Google calendar provider used to be installed by the xul-ext-gdata- provider binary package, but it's nowadays an empty transitional package. It was removed in version 60.0 (see https://bazaar.launchpad.net/~mozillateam/thunderbird/thunderbird.bionic/revision/446), so this is not a regression.
You can install it from addons.thunderbird.net: https://addons.thunderbird.net/thunderbird/addon/provider-for-google- calendar/ (the version there should be compatible with thunderbird 68.2.1. ** Changed in: thunderbird (Ubuntu) Status: New => Invalid ** Tags added: bot-stop-nagging -- 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/1852097 Title: Google Calendar provider is missing in Thunderbird 68.2.1 in bionic- proposed Status in thunderbird package in Ubuntu: Invalid Bug description: The Google Calendar provider is missing in Thunderbird 68.2.1 in bionic-proposed. ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: xul-ext-lightning 1:68.2.1+build1-0ubuntu0.18.04.1 ProcVersionSignature: Ubuntu 5.0.0-32.34~18.04.2-generic 5.0.21 Uname: Linux 5.0.0-32-generic x86_64 AddonCompatCheckDisabled: False ApportVersion: 2.20.9-0ubuntu7.9 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: amr 2089 F.... pulseaudio BuildID: 20191031185816 Channel: Unavailable CurrentDesktop: communitheme:ubuntu:GNOME Date: Mon Nov 11 17:19:31 2019 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 2018-11-29 (346 days ago) InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725) IpRoute: default via 141.23.192.1 dev wlp6s0 proto dhcp metric 600 141.23.192.0/19 dev wlp6s0 proto kernel scope link src 141.23.216.93 metric 600 169.254.0.0/16 dev virbr0 scope link metric 1000 linkdown 192.168.122.0/24 dev virbr0 proto kernel scope link src 192.168.122.1 linkdown Locales: extensions.sqlite corrupt or missing MostRecentCrashID: bp-b6869c51-47ea-4d0c-b5a8-08b020190419 PrefErrors: Unexpected character ',' before close parenthesis @ /usr/lib/thunderbird/omni.ja:greprefs.js:1141 PrefSources: prefs.js Profiles: Profile0 (Default) - LastVersion=68.2.1/20191031185816 (In use) RunningIncompatibleAddons: False SourcePackage: thunderbird SubmittedCrashIDs: bp-b6869c51-47ea-4d0c-b5a8-08b020190419 Themes: extensions.sqlite corrupt or missing UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 06/03/2019 dmi.bios.vendor: LENOVO dmi.bios.version: R0QET57W (1.34 ) dmi.board.asset.tag: Not Available dmi.board.name: 20LTS01800 dmi.board.vendor: LENOVO dmi.board.version: Not Defined dmi.chassis.asset.tag: No Asset Information dmi.chassis.type: 10 dmi.chassis.vendor: LENOVO dmi.chassis.version: None dmi.modalias: dmi:bvnLENOVO:bvrR0QET57W(1.34):bd06/03/2019:svnLENOVO:pn20LTS01800:pvrThinkPadL480:rvnLENOVO:rn20LTS01800:rvrNotDefined:cvnLENOVO:ct10:cvrNone: dmi.product.family: ThinkPad L480 dmi.product.name: 20LTS01800 dmi.product.sku: LENOVO_MT_20LT_BU_Think_FM_ThinkPad L480 dmi.product.version: ThinkPad L480 dmi.sys.vendor: LENOVO To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/thunderbird/+bug/1852097/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp

