Newsgroup: it.comp.os.linux.iniziare
Titolo: The repository 'archive.ubuntu.com/ubuntu sylvia Release' does not have a Release file

Mi succede da sabato facendo "sudo apt-get update", sia da terminale che 
con synaptic:
 >The repository '
http://archive.ubuntu.com/ubuntu
 sylvia Release' does 
not have a Release file.
bla bla ... (i dettagli sono in coda)
 
Come letto in rete ho provato sia a cambiare i "mirrors" dei repository 
ufficiali, che a "restorare i defaults" in synaptic.
MA : ciccia !
 
Qualcuno ha idee ?
Posso fregarmene e fare comunque gli aggiornamenti ?
GRAZIE !!!
 
System:    Kernel: 4.4.0-87-generic x86_64 (64 bit)
            Desktop: Cinnamon 3.6.7
            Distro: Linux Mint 18.3 Sylvia
 
The repository '
http://archive.ubuntu.com/ubuntu
 sylvia Release' does 
not have a Release file.
Data from such a repository can't be authenticated and is therefore 
potentially dangerous to use.See apt-secure(8) manpage for repository 
creation and user configuration details.
Failed to fetch 
http://archive.ubuntu.com/ubuntu/dists/sylvia/main/binary-amd64/Packages
 
  404  Not Found [IP: 91.189.88.173 80]Some index files failed to download.
They have been ignored, or old ones used instead.
 
 

Se a un volenteroso potesse interessare, riporto anche l'output di
inxi -r
"sylvia compare solo in 2 posti:
 >deb 
http://archive.ubuntu.com/ubuntu
 sylvia main universe
 >deb 
http://packages.linuxmint.com
 sylvia main upstream import backport
Grazie ancora!
 
inxi -r
Repos:     Active apt sources in file: 
/etc/apt/sources.list.d/additional-repositories.list
            deb 
http://www.ap-i.net/apt
 stable main
            deb [arch=i386,amd64] 
https://deb.opera.com/opera-stable/
 
stable non-free
            deb 
http://archive.ubuntu.com/ubuntu
 sylvia main universe
            Active apt sources in file: 
/etc/apt/sources.list.d/alexlarsson-flatpak-xenial.list
            deb 
http://ppa.launchpad.net/alexlarsson/flatpak/ubuntu
 
xenial main
            deb-src 
http://ppa.launchpad.net/alexlarsson/flatpak/ubuntu
 
xenial main
            Active apt sources in file: 
/etc/apt/sources.list.d/christian-boxdoerfer-fsearch-daily-xenial.list
            deb 
http://ppa.launchpad.net/christian-boxdoerfer/fsearch-daily/ubuntu
 
xenial main
            deb-src 
http://ppa.launchpad.net/christian-boxdoerfer/fsearch-daily/ubuntu
 
xenial main
            Active apt sources in file: 
/etc/apt/sources.list.d/crass-ufraw-xenial.list
            deb 
http://ppa.launchpad.net/crass/ufraw/ubuntu
 xenial main
            deb-src 
http://ppa.launchpad.net/crass/ufraw/ubuntu
 xenial main
            Active apt sources in file: 
/etc/apt/sources.list.d/danielrichter2007-grub-customizer-xenial.list
            deb 
http://ppa.launchpad.net/danielrichter2007/grub-customizer/ubuntu
 xenial 
main
            deb-src 
http://ppa.launchpad.net/danielrichter2007/grub-customizer/ubuntu
 xenial 
main
            Active apt sources in file: 
/etc/apt/sources.list.d/gambas-team-gambas3-xenial.list
            deb 
http://ppa.launchpad.net/gambas-team/gambas3/ubuntu
 
xenial main
            deb-src 
http://ppa.launchpad.net/gambas-team/gambas3/ubuntu
 
xenial main
            Active apt sources in file: 
/etc/apt/sources.list.d/gezakovacs-ppa-xenial.list
            deb 
http://ppa.launchpad.net/gezakovacs/ppa/ubuntu
 xenial main
            deb-src 
http://ppa.launchpad.net/gezakovacs/ppa/ubuntu
 
xenial main
            Active apt sources in file: 
/etc/apt/sources.list.d/jcfp-nobetas-xenial.list
            deb 
http://ppa.launchpad.net/jcfp/nobetas/ubuntu
 xenial main
            deb-src 
http://ppa.launchpad.net/jcfp/nobetas/ubuntu
 xenial main
            Active apt sources in file: 
/etc/apt/sources.list.d/jcfp-sab-addons-xenial.list
            deb 
http://ppa.launchpad.net/jcfp/sab-addons/ubuntu
 xenial main
            deb-src 
http://ppa.launchpad.net/jcfp/sab-addons/ubuntu
 
xenial main
            Active apt sources in file: 
/etc/apt/sources.list.d/mscore-ubuntu-mscore-stable-xenial.list
            deb 
http://ppa.launchpad.net/mscore-ubuntu/mscore-stable/ubuntu
 xenial main
            deb-src 
http://ppa.launchpad.net/mscore-ubuntu/mscore-stable/ubuntu
 xenial main
            Active apt sources in file: 
/etc/apt/sources.list.d/official-package-repositories.list
            deb 
http://packages.linuxmint.com
 sylvia main upstream 
import backport
            deb 
http://archive.ubuntu.com/ubuntu
 xenial main restricted 
universe multiverse
            deb 
http://archive.ubuntu.com/ubuntu
 xenial-updates main 
restricted universe multiverse
            deb 
http://archive.ubuntu.com/ubuntu
 xenial-backports main 
restricted universe multiverse
            deb 
http://security.ubuntu.com/ubuntu/
 xenial-security main 
restricted universe multiverse
            deb 
http://archive.canonical.com/ubuntu/
 xenial partner
            Active apt sources in file: 
/etc/apt/sources.list.d/qbittorrent-team-qbittorrent-stable-xenial.list
            deb 
http://ppa.launchpad.net/qbittorrent-team/qbittorrent-stable/ubuntu
 
xenial main
            deb-src 
http://ppa.launchpad.net/qbittorrent-team/qbittorrent-stable/ubuntu
 
xenial main
            Active apt sources in file: 
/etc/apt/sources.list.d/sandromani-gimagereader-xenial.list
            deb 
http://ppa.launchpad.net/sandromani/gimagereader/ubuntu
 
xenial main
            deb-src 
http://ppa.launchpad.net/sandromani/gimagereader/ubuntu
 xenial main
            Active apt sources in file: 
/etc/apt/sources.list.d/teamviewer.list
            deb 
http://linux.teamviewer.com/deb
 stable main
            Active apt sources in file: 
/etc/apt/sources.list.d/umang-indicator-stickynotes-xenial.list
            deb 
http://ppa.launchpad.net/umang/indicator-stickynotes/ubuntu
 xenial main
            deb-src 
http://ppa.launchpad.net/umang/indicator-stickynotes/ubuntu
 xenial main
            Active apt sources in file: 
/etc/apt/sources.list.d/zeal-developers-ppa-xenial.list
            deb 
http://ppa.launchpad.net/zeal-developers/ppa/ubuntu
 
xenial main
            deb-src 
http://ppa.launchpad.net/zeal-developers/ppa/ubuntu
 
xenial main