I opened Ubuntu 16.04 after more than 2 months and now I receive an error to install any package (I tried to install redshift
package(night mode)).
ERROR E: Unable to locate package apt_pkg
I tried to update Ubuntu, then I received errors:
W: The repository 'http://ppa.launchpad.net/jonathonf/python-3.6/ubuntu xenial Release' does not have a Release file.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: Failed to fetch http://ppa.launchpad.net/jonathonf/python-3.6/ubuntu/dists/xenial/main/binary-amd64/Packages 404 Not Found [IP: 91.189.95.83 80]
E: Some index files failed to download. They have been ignored, or old ones used instead.
Another issue is terminal isn't opening from search bar, I am forced to right-click on desktop and select to open it. Software & updates and even software updater programs are not opening (It's like opening for 1 sec and closing).
I tried to reinstall gnome-software
. After uninstalling it, I get an error:
E: Package 'gnome-software' has no installation candidate