Thank you for taking the time to report this bug. It should be noted that 19.04 is an EOL release for Lubuntu. I am however able to confirm the same behavior in both Lubuntu 19.10 and 20.04 development release installed from 20200303 daily media.
** Changed in: software-properties (Ubuntu) Status: New => Confirmed ** Changed in: software-properties (Ubuntu) Importance: Undecided => High -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to software-properties in Ubuntu. https://bugs.launchpad.net/bugs/1865906 Title: software-properties-* import key issue Status in lubuntu-meta package in Ubuntu: Incomplete Status in software-properties package in Ubuntu: Confirmed Bug description: My system: Lubuntu 19.04 run from Live-CD (from the original ISO image) Note: Followig issue apply to both software-properties: Qt and KDE run from LiveCD. After opening thru the console (as root) the software-properties, switching to the "Authentication" tab and pressing the "Import key file", I recieve following error output: # software-properties-qt QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-root' Trackback (most recent call last): File "/usr/lib/python3/dist-packages/softwareproperties/qt/SoftwarePropertiesQt.py", line 712, in add_key_clicked url = KUrl.fromPath(home) NameError: name 'KUrl' is not defined ================================================= same happens with software-properties-kde. When I'm trying to check their version, I'll get following output: # software-properties-qt -v QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime- root' software-properties-qt To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/lubuntu-meta/+bug/1865906/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp