Hab's gefunden und installiert. Danke.
Slack startet nur nicht. Dies wird im journal angezeigt beim Startversuch:
Dec 02 21:26:16 linux.fritz.box plasmashell[2312]: file:///usr/share/plasma/plasmoids/org.kde.plasma.taskmanager/contents/ui/main.qml:455: TypeError: Type error
Dec 02 21:26:16 linux.fritz.box systemd[1977]: Started snap.slack.slack.3da91ed7-4d63-4548-9979-555cae624645.scope.
Dec 02 21:26:16 linux.fritz.box plasmashell[2312]: file:///usr/share/plasma/plasmoids/org.kde.plasma.taskmanager/contents/ui/Task.qml:374: Unable to assign [undefined] to QString
Dec 02 21:26:16 linux.fritz.box kwin_x11[2306]: qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 10748, resource id: 35655614, major code: 18 (ChangeProperty), minor code: 0
Dec 02 21:26:17 linux.fritz.box systemd[1977]: snap.slack.slack.3da91ed7-4d63-4548-9979-555cae624645.scope: Succeeded.
Das steht im log:
2021-12-02T21:28:56.208481+01:00 localhost kwin_x11[2306]: qt.svg: <input>:413:631: Could not add child element to parent element because the types are incorrect.