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giovanna@Inspiron-3542:~$ sudo apt-get install synaptic
Lettura elenco dei pacchetti... Fatto
Generazione albero delle dipendenze       
Lettura informazioni sullo stato... Fatto
Il pacchetto synaptic non ha versioni disponibili, ma è nominato da un altro
pacchetto. Questo potrebbe indicare che il pacchetto è mancante, obsoleto
oppure è disponibile solo all'interno di un'altra sorgente

E: Il pacchetto "synaptic" non ha candidati da installare

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sudo apt update && sudo apt install synaptic

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giovanna@Inspiron-3542:~$ sudo apt update && sudo apt install synaptic
[sudo] password di giovanna: 
Trovato:1 http://archive.ubuntu.com/ubuntu yakkety InRelease
Ign:2 http://ppa.launchpad.net/michael-gruz/canon-stable/ubuntu raring InRelease
Ign:3 http://ppa.launchpad.net/inameiname/stable/ubuntu yakkety InRelease
Ign:4 http://ppa.launchpad.net/michael-gruz/canon-trunk/ubuntu yakkety InRelease
Ign:5 http://ppa.launchpad.net/michael-gruz/canon/ubuntu yakkety InRelease
Trovato:6 http://ppa.launchpad.net/screenlets/ppa/ubuntu yakkety InRelease
Trovato:7 http://ppa.launchpad.net/teejee2008/ppa/ubuntu yakkety InRelease
Trovato:8 http://ppa.launchpad.net/michael-gruz/canon-stable/ubuntu raring Release
Err:9 http://ppa.launchpad.net/inameiname/stable/ubuntu yakkety Release
  404  Not Found
Err:10 http://ppa.launchpad.net/michael-gruz/canon-trunk/ubuntu yakkety Release
  404  Not Found
Err:11 http://ppa.launchpad.net/michael-gruz/canon/ubuntu yakkety Release
  404  Not Found
Lettura elenco dei pacchetti... Fatto
E: The repository 'http://ppa.launchpad.net/inameiname/stable/ubuntu yakkety Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: The repository 'http://ppa.launchpad.net/michael-gruz/canon-trunk/ubuntu yakkety Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: The repository 'http://ppa.launchpad.net/michael-gruz/canon/ubuntu yakkety Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: http://ppa.launchpad.net/michael-gruz/canon-stable/ubuntu/dists/raring/Release.gpg: Signature by key 84E550CD36EC35430A66AC5A03396E1C3F7B4A1D uses weak digest algorithm (SHA1)

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cat -n /etc/apt/sources.list

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la -1 /etc/apt/sources.list.d