ubuntu dock + desktop icons disappeared

[Lazar Janos]

After starting my computer, ubuntu dock was absent. Through using the hot corner it is reachable and functional, but otherwise it is invisible.
The settings | appearance menu: position on screen dropdown goes blank, but setting anything does not either change (fix) the position. The rest of settings is greyed out.
The hints from https://itsfoss.com/disable-ubuntu-dock/: the "extensions" application does not list anything from the "built-in" section, e.g. desktop icons + ubuntu appindicators + ubuntu dock.
In case I try to reinstall (enable?) dock from gnome extensions, it says "error". Before the on-off button changed permanently to "error", triggering it put these lines in logs:

Dec 15 15:02:07 gep gnome-shell[15353]: Archive: /tmp/VX9BV0.shell-extension.zip
Dec 15 15:02:07 gep gnome-shell[15353]: inflating: /<email address hidden>/locale/it/LC_MESSAGES/gnome-shell-extensions.mo
Dec 15 15:02:07 gep gnome-shell[15353]: inflating: /<email address hidden>/COPYING
Dec 15 15:02:07 gep gnome-shell[15353]: creating: /<email address hidden>/locale/he/LC_MESSAGES/
Dec 15 15:02:07 gep gnome-shell[15353]: creating: /<email address hidden>/schemas/
Dec 15 15:02:07 gep gnome-shell[15353]: inflating: /<email address hidden>/schemas/org.gnome.shell.extensions.dock.gschema.xml
Dec 15 15:02:07 gep gnome-shell[15353]: inflating: /<email address hidden>/stylesheet.css
Dec 15 15:02:07 gep gnome-shell[15353]: inflating: /<email address hidden>/extension.js
Dec 15 15:02:07 gep gnome-shell[15353]: inflating: /<email address hidden>/schemas/gschemas.compiled
Dec 15 15:02:07 gep gnome-shell[15353]: inflating: /<email address hidden>/convenience.js
Dec 15 15:02:07 gep gnome-shell[15353]: inflating: /<email address hidden>/locale/he/LC_MESSAGES/gnome-shell-extensions.mo
Dec 15 15:02:07 gep gnome-shell[15353]: extracting: /<email address hidden>/metadata.json
Dec 15 15:02:07 gep gnome-shell[1823]: JS ERROR: Extension <email address hidden>: TypeError: Shell.GenericContainer is not a constructor#012_init@/<email address hidden>/extension.js:391:22#012wrapper@resource:///org/gnome/gjs/modules/script/_legacy.js:82:27#012_Base.prototype._construct@resource:///org/gnome/gjs/modules/script/_legacy.js:18:10#012newClass@resource:///org/gnome/gjs/modules/script/_legacy.js:114:21#012enable@/<email address hidden>/extension.js:985:12#012_callExtensionEnable@resource:///org/gnome/shell/ui/extensionSystem.js:167:32#012loadExtension@resource:///org/gnome/shell/ui/extensionSystem.js:349:26#012callback@resource:///org/gnome/shell/ui/extensionDownloader.js:234:39#012gotExtensionZipFile/<@resource:///org/gnome/shell/ui/extensionDownloader.js:115:13

It may be the result of system corruption, since in the last years my computer tends NOT to come back from suspend (from 30% now it reached 100%).

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: ubiquity (not installed)
ProcVersionSignature: Ubuntu 5.4.0-58.64-generic 5.4.73
Uname: Linux 5.4.0-58-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.13
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Tue Dec 15 15:13:19 2020
InstallCmdLine: file=/cdrom/preseed/ubuntu.seed boot=casper only-ubiquity initrd=/casper/initrd quiet splash ---
InstallationDate: Installed on 2019-10-12 (430 days ago)
InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Release amd64 (20190416)
SourcePackage: ubiquity
Symptom: installation
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Lazar Janos (hurjup)]

I managed to fix it simply by reinstall -- 'sudo apt-get remove gnome-shell-extension-ubuntu-dock' or even better 'sudo apt-get remove gnome-shell-extensions gnome-shell-extension-ubuntu-dock'.
Other gnome extensions are still impossible to add though, however it may be a different problem.

[Paul White (paulw2u)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. We are sorry that we do not always have the capacity to look at all reported bugs in a timely manner.

Further to your feedback I'll close this as being invalid as the issue seems to have been resolved, in part at least, by reinstalling the ubuntu-dock package.

Should you experience similar problems in future please raise a bug report against the affected package and not ubiquity (the installer). Thanks.