19.04 Can’t remove realvnc server

Instructions fail when trying to uninstall RealVNC from Ubuntu 19.04: https://help.realvnc.com/hc/en-us/articles/360002250957-Completely-Removing-VNC-Connect sudo apt remove realvnc-vnc-server Reading package lists… Done Building dependency tree Reading state information… Done E: Unable to locate package realvnc-vnc-server How do I confirm it is installed or removed, and if still installed, how do I uninstall it?

Upgrade from disco to eaon – 4 packages can be upgraded, but not possible to update

Im trying to upgrade to 19.10 from my 19.04 which is EOL. # apt update 4 packages can be upgraded. Run ‘apt list –upgradable’ to see them. apt list –upgradable libgl1-mesa-dri/bionic-security 19.2.8-0ubuntu0~18.04.2 amd64 [upgradable from: 19.0.8-0ubuntu0~19.04.1] libgl1-mesa-dri/bionic-security 19.2.8-0ubuntu0~18.04.2 i386 [upgradable from: 19.0.8-0ubuntu0~19.04.1] libjavascriptcoregtk-4.0-18/bionic-security 2.26.4-0ubuntu0.18.04.1 amd64 [upgradable from: 2.26.2-0ubuntu0.19.04.1] libwebkit2gtk-4.0-37/bionic-security 2.26.4-0ubuntu0.18.04.1 amd64 [upgradable from: 2.26.2-0ubuntu0.19.04.1] apt…

GPG error: The following signatures were invalid: ########

I got this issue while running apt update command : Err:12 http://us.archive.ubuntu.com/ubuntu precise-security InRelease The following signatures were invalid: 630239CC130E1A7FD81A27B140976EAF437D05B5 Get:15 http://us.archive.ubuntu.com/ubuntu precise-updates InRelease [55.7 kB] Err:15 http://us.archive.ubuntu.com/ubuntu precise-updates InRelease The following signatures were invalid: 630239CC130E1A7FD81A27B140976EAF437D05B5 Get:21 http://us.archive.ubuntu.com/ubuntu precise-backports InRelease [55.7 kB] Err:21 http://us.archive.ubuntu.com/ubuntu precise-backports InRelease The following signatures were invalid: 630239CC130E1A7FD81A27B140976EAF437D05B5 Get:27 http://us.archive.ubuntu.com/ubuntu precise…