When I run sudo apt-get update on Ubuntu 19.04 it results in:
Err:1 http://lt.archive.ubuntu.com/ubuntu disco InRelease
Could not connect to lt.archive.ubuntu.com:80 (193.219.61.87). - connect (111: Connection refused) Cannot initiate the connection to lt.archive.ubuntu.com:80 (2001:778::87). - connect (101: Network is unreachable)
Err:2 http://lt.archive.ubuntu.com/ubuntu disco-updates InRelease
Cannot initiate the connection to lt.archive.ubuntu.com:80 (2001:778::87). - connect (101: Network is unreachable)
Get:3 http://deb.playonlinux.com trusty InRelease [2,590 B]
Hit:4 http://security.ubuntu.com/ubuntu disco-security InRelease
Ign:5 http://ppa.launchpad.net/gnome3-team/gnome3/ubuntu disco InRelease
Err:6 http://ppa.launchpad.net/gnome3-team/gnome3/ubuntu disco Release
404 Not Found [IP: 91.189.95.83 80]
Ign:7 http://download.opensuse.org/repositories/home:/strycore/xUbuntu_16.04 InRelease
Get:8 http://download.opensuse.org/repositories/home:/strycore/xUbuntu_16.04 Release [986 B]
Get:9 http://deb.playonlinux.com trusty/main amd64 Packages [564 B]
Get:10 http://download.opensuse.org/repositories/home:/strycore/xUbuntu_16.04 Release.gpg [481 B]
Get:11 http://deb.playonlinux.com trusty/main i386 Packages [564 B]
Get:12 http://download.opensuse.org/repositories/home:/strycore/xUbuntu_16.04 Packages [831 B]
Reading package lists... Done
E: The repository 'http://ppa.launchpad.net/gnome3-team/gnome3/ubuntu disco Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
I cannot install any program with sudo apt-get install. How can I fix this situation?
