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Thread: can't update ubuntu

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"apt authentication issue

problem during package list update. package list update failed authentication failure. happens behind network proxy server. please try click on "run action now" button correct problem or update list manually running update manager , clicking on "check".


"
"w: error occurred during signature verification. repository not updated , previous index files used.gpg error: http://deb.opera.com stable release: following signatures couldn't verified because public key not available: no_pubkey a2019ea84e7532c8

w: failed fetch http://deb.opera.com/opera/dists/stable/release

w: failed fetch http://ppa.launchpad.net/docbar-main...86/packages.gz 404 not found

w: failed fetch http://ppa.launchpad.net/jonis/redsh...86/packages.gz 404 not found

w: failed fetch http://ppa.launchpad.net/sushi/smpla...86/packages.gz 404 not found

w: failed fetch http://ppa.launchpad.net/user/ppa-na...86/packages.gz 404 not found

w: index files failed download, have been ignored, or old ones used instead.
"

have idea how can work around this?

quote posted princeofnam view post
"apt authentication issue

problem during package list update. package list update failed authentication failure. happens behind network proxy server. please try click on "run action now" button correct problem or update list manually running update manager , clicking on "check".


"
"w: error occurred during signature verification. repository not updated , previous index files used.gpg error: http://deb.opera.com stable release: following signatures couldn't verified because public key not available: no_pubkey a2019ea84e7532c8

w: failed fetch http://deb.opera.com/opera/dists/stable/release

w: failed fetch http://ppa.launchpad.net/docbar-main...86/packages.gz 404 not found

w: failed fetch http://ppa.launchpad.net/jonis/redsh...86/packages.gz 404 not found

w: failed fetch http://ppa.launchpad.net/sushi/smpla...86/packages.gz 404 not found

w: failed fetch http://ppa.launchpad.net/user/ppa-na...86/packages.gz 404 not found

w: index files failed download, have been ignored, or old ones used instead.
"

have idea how can work around this?
remove useless "not found" repositories system list , install gpg key opera repository.


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