Linux Distro: Lubuntu 19.04

My system is working fine but I just get distracted when I update my packages because of this error which I don't know how to fix. I've been finding some related topics and I tried their solution but still fail to fix the error.sudo apt update gives this error

sudo apt update
Hit:1 http://repo.steampowered.com/steam precise InRelease
Hit:2 http://packages.microsoft.com/repos/vscode stable InRelease              
Ign:3 http://dl.google.com/linux/chrome/deb stable InRelease                   
Hit:4 http://dl.google.com/linux/chrome/deb stable Release                     
Hit:5 http://archive.ubuntu.com/ubuntu disco InRelease
Hit:6 http://ppa.launchpad.net/graphics-drivers/ppa/ubuntu disco InRelease
Hit:8 http://archive.ubuntu.com/ubuntu disco-updates InRelease           
Hit:9 http://archive.ubuntu.com/ubuntu disco-security InRelease          
Hit:10 http://ppa.launchpad.net/nilarimogard/webupd8/ubuntu disco InRelease
Error: GDBus.Error:org.freedesktop.systemd1.UnitMasked: Unit -.mount is masked.
Reading package lists... Done
Building dependency tree       
Reading state information... Done
All packages are up to date.

Edit: Here is the results of the terminal whenever I use update. Sorry for inconvenience.

  • 1
    Please don't provide pictures of text. We cannot copy text from a picture to look up information or use it in replies. Pictures of text are also much much harder to read. We also cannot copy from a heading (unless we edit your question) so heading text should also appear in the question itself (depending on device used to view site, heading may not be viewed when reading question too!) – guiverc Aug 26 at 11:07

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