This likely has something to do with the following two PPAs you have enabled and installed packages from.
./etc/apt/sources.list.d/ondrej-ubuntu-nginx-artul.list ./etc/apt/sources.list.d/ondrej-ubuntu-php-artful.list
Please remove those PPAs using the tool ppa-purge and try the upgrade again. Thanks!
This likely has something to do with the following two PPAs you have enabled and installed packages from.
./etc/apt/ sources. list.d/ ondrej- ubuntu- nginx-artul. list sources. list.d/ ondrej- ubuntu- php-artful. list
./etc/apt/
Please remove those PPAs using the tool ppa-purge and try the upgrade again. Thanks!