That is what heppen so often when ppa is used:
ERROR IOError/SystemError in cache.update(): 'E:The repository
'http://ppa.launchpad.net/jonathonf/gcc-7.1/ubuntu artful Release' does
not have a Release file.
So use ppa-purge to downgrade the ppa's packages to genuine version;
then clean the system via 'gtkorphan' & 'bleachbit' (as root, carefully
select options), and finally reboot.
Try then again to upgrade, the installer should be happier.
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1770847
Title:
ubuntu 18.04
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