Created attachment 128114 [details] Screenshot of the error. SUMMARY Could not download packages using Muon package manager. STEPS TO REPRODUCE 1. Open 'Muon Package Manager'. 2. Select 'Check for Updates'. OBSERVED RESULT Getting error 'Could not download packages. http://ppa.launchpad.net/deadsnakes/ppa/ubuntu/dists/disco/Release 404 Not Found [IP: 2001:67c:1560:8008::15 80] http://archive.ubuntu.com/ubuntu/dists/disco/Release 404 Not Found [IP: 2001:67c:1562::18 80] http://ppa.launchpad.net/noobslab/apps/ubuntu/dists/disco/Release 404 Not Found [IP: 2001:67c:1560:8008::15 80] http://archive.ubuntu.com/ubuntu/dists/disco-updates/Release 404 Not Found [IP: 2001:67c:1562::18 80] http://archive.ubuntu.com/ubuntu/dists/disco-backports/Release 404 Not Found [IP: 2001:67c:1562::18 80] http://archive.ubuntu.com/ubuntu/dists/disco-security/Release 404 Not Found [IP: 2001:67c:1562::18 80] EXPECTED RESULT SOFTWARE/OS VERSIONS Windows: macOS: Linux/KDE Plasma: 19.04 (available in About System) KDE Plasma Version: 5.15.4 KDE Frameworks Version: 5.56.0 Qt Version: 5.12.2 ADDITIONAL INFORMATION
Ubuntu disco has reached end of life on 23 Jan 2020. The archives have been removed from mirrors. You should update your system! https://wiki.ubuntu.com/Releases
*** Bug 424400 has been marked as a duplicate of this bug. ***