data zachráněna, Xenial Xerus nainstalovaný, děkuju
jen se mi ted při aktualizaci software zobrazuje následující hlášení :
W:The repository '
http://cz.archive.ubuntu.com/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(

manpage for repository creation and user configuration details., W:The repository '
http://cz.archive.ubuntu.com/ubuntu xenial-updates 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(

manpage for repository creation and user configuration details., W:The repository '
http://cz.archive.ubuntu.com/ubuntu xenial-backports 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(

manpage for repository creation and user configuration details., E:Failed to fetch
http://cz.archive.ubuntu.com/ubuntu/dists/xenial/main/source/Sources 403 Forbidden [IP: 217.31.202.63 80], E:Failed to fetch
http://cz.archive.ubuntu.com/ubuntu/dists/xenial/universe/source/Sources 403 Forbidden [IP: 217.31.202.63 80], E:Failed to fetch
http://cz.archive.ubuntu.com/ubuntu/dists/xenial/multiverse/source/Sources 403 Forbidden [IP: 217.31.202.63 80], E:Failed to fetch
http://cz.archive.ubuntu.com/ubuntu/dists/xenial/restricted/source/Sources 403 Forbidden [IP: 217.31.202.63 80], E:Failed to fetch
http://cz.archive.ubuntu.com/ubuntu/dists/xenial/main/binary-amd64/Packages 403 Forbidden [IP: 217.31.202.63 80], E:Failed to fetch
http://cz.archive.ubuntu.com/ubuntu/dists/xenial/main/binary-i386/Packages 403 Forbidden [IP: 217.31.202.63 80], E:Failed to fetch
http://cz.archive.ubuntu.com/ubuntu/dists/xenial/restricted/binary-amd64/Packages 403 Forbidden [IP: 217.31.202.63 80], E:Failed to fetch
http://cz.archive.ubuntu.com/ubuntu/dists/xenial-updates/main/source/Sources 403 Forbidden [IP: 217.31.202.63 80], E:Failed to fetch
http://cz.archive.ubuntu.com/ubuntu/dists/xenial-updates/universe/source/Sources 403 Forbidden [IP: 217.31.202.63 80], E:Failed to fetch
http://cz.archive.ubuntu.com/ubuntu/dists/xenial-updates/multiverse/source/Sources 403 Forbidden [IP: 217.31.202.63 80], E:Failed to fetch
http://cz.archive.ubuntu.com/ubuntu/dists/xenial-updates/restricted/source/Sources 403 Forbidden [IP: 217.31.202.63 80], E:Failed to fetch
http://cz.archive.ubuntu.com/ubuntu/dists/xenial-updates/main/binary-amd64/Packages 403 Forbidden [IP: 217.31.202.63 80], E:Failed to fetch
http://cz.archive.ubuntu.com/ubuntu/dists/xenial-updates/main/binary-i386/Packages 403 Forbidden [IP: 217.31.202.63 80], E:Failed to fetch
http://cz.archive.ubuntu.com/ubuntu/dists/xenial-updates/restricted/binary-amd64/Packages 403 Forbidden [IP: 217.31.202.63 80], E:Failed to fetch
http://cz.archive.ubuntu.com/ubuntu/dists/xenial-backports/main/source/Sources 403 Forbidden [IP: 217.31.202.63 80], E:Failed to fetch
http://cz.archive.ubuntu.com/ubuntu/dists/xenial-backports/restricted/source/Sources 403 Forbidden [IP: 217.31.202.63 80], E:Failed to fetch
http://cz.archive.ubuntu.com/ubuntu/dists/xenial-backports/universe/source/Sources 403 Forbidden [IP: 217.31.202.63 80], E:Failed to fetch
http://cz.archive.ubuntu.com/ubuntu/dists/xenial-backports/multiverse/source/Sources 403 Forbidden [IP: 217.31.202.63 80], E:Failed to fetch
http://cz.archive.ubuntu.com/ubuntu/dists/xenial-backports/main/binary-amd64/Packages 403 Forbidden [IP: 217.31.202.63 80], E:Failed to fetch
http://cz.archive.ubuntu.com/ubuntu/dists/xenial-backports/main/binary-i386/Packages 403 Forbidden [IP: 217.31.202.63 80], E:Failed to fetch
http://cz.archive.ubuntu.com/ubuntu/dists/xenial-backports/restricted/binary-amd64/Packages 403 Forbidden [IP: 217.31.202.63 80], E:Some index files failed to download. They have been ignored, or old ones used instead.
Nevíte, prosím, co s tím?