'classe' KeyError '' (“o cache não tem nenhum pacote chamado 'wine-staging-I386'”) [duplicado]

Question

Estou recebendo o seguinte erro:

$sudoapt-getupdate#partialoutputReadingpackagelists...DoneW:GPGerror:https://download.01.orgtrustyRelease:Thefollowingsignaturescouldn'tbeverifiedbecausethepublickeyisnotavailable:NO_PUBKEYA902DDA375E52366W:Failedtofetchhttp://us.archive.ubuntu.com/ubuntu/dists/trusty/InReleaseW:Failedtofetchhttp://us.archive.ubuntu.com/ubuntu/dists/trusty-updates/InReleaseW:Failedtofetchhttp://us.archive.ubuntu.com/ubuntu/dists/trusty-backports/InReleaseW:Failedtofetchhttp://extras.ubuntu.com/ubuntu/dists/trusty/InReleaseW:Failedtofetchhttp://dl.google.com/linux/chrome/deb/dists/stable/InReleaseW:Failedtofetchhttp://us.archive.ubuntu.com/ubuntu/dists/trusty/Release.gpgCouldnotresolve'us.archive.ubuntu.com'W:Failedtofetchhttp://us.archive.ubuntu.com/ubuntu/dists/trusty-updates/Release.gpgCouldnotresolve'us.archive.ubuntu.com'W:Failedtofetchhttp://us.archive.ubuntu.com/ubuntu/dists/trusty-backports/Release.gpgCouldnotresolve'us.archive.ubuntu.com'W:Failedtofetchhttp://dl.google.com/linux/chrome/deb/dists/stable/Release.gpgCouldnotresolve'dl.google.com'W:Failedtofetchhttp://extras.ubuntu.com/ubuntu/dists/trusty/Release.gpgCouldnotresolve'extras.ubuntu.com'W:Someindexfilesfailedtodownload.Theyhavebeenignored,oroldonesusedinstead.

Saída completa

    

Answer 1

Ok, depois de experimentar várias coisas, finalmente descobri:

sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys A902DDA375E52366

então corri

sudo apt-get update && sudo apt-get upgrade

O BUt acabou recebendo o mesmo erro de antes:

The following packages have been kept back:
wine-staging wine-staging-amd64 wine-staging-i386:i386
0 upgraded, 0 newly installed, 0 to remove and 3 not upgraded.

Depois, cliquei no erro mostrado na captura de tela anexada acima - > mostrar atualizações - > e as atualizações foram bem. Espero adicionar essa chave foi a coisa certa a fazer ....? Além disso, alguém sabe por que comecei a receber esse erro (assim posso evitar isso no futuro)?