При обновлении менеджером выкидывает такое:
W:Target Packages (partner/binary-amd64/Packages) is configured multiple times in /etc/apt/sources.list:48 and /etc/apt/sources.list.d/xenial-partner.list:4, W:Target Packages (partner/binary-i386/Packages) is configured multiple times in /etc/apt/sources.list:48 and /etc/apt/sources.list.d/xenial-partner.list:4, W:Target Packages (partner/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:48 and /etc/apt/sources.list.d/xenial-partner.list:4, W:Target Translations (partner/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list:48 and /etc/apt/sources.list.d/xenial-partner.list:4, W:Target Translations (partner/i18n/Translation-ru) is configured multiple times in /etc/apt/sources.list:48 and /etc/apt/sources.list.d/xenial-partner.list:4, W:Target DEP-11 (partner/dep11/Components-amd64.yml) is configured multiple times in /etc/apt/sources.list:48 and /etc/apt/sources.list.d/xenial-partner.list:4, W:Target DEP-11-icons (partner/dep11/icons-64x64.tar) is configured multiple times in /etc/apt/sources.list:48 and /etc/apt/sources.list.d/xenial-partner.list:4, W:The repository 'http://ppa.launchpad.net/colingille/freshlight/ubuntu xenial Release' does not have a Release file., W:Data from such a repository can't be authenticated and is therefore potentially dangerous to use., W:See apt-secure(8) manpage for repository creation and user configuration details., W:http://cz.archive.ubuntu.com/ubuntu/dists/precise/Release.gpg: Signature by key 630239CC130E1A7FD81A27B140976EAF437D05B5 uses weak digest algorithm (SHA1), E:Failed to fetch http://ppa.launchpad.net/colingille/freshlight/ubuntu/dists/xenial/main/binary-amd64/Packages 404 Not Found, E:Some index files failed to download. They have been ignored, or old ones used instead.