در آپدیت همونطور که تو عکس میبینید ارور هایی وجود داره
علتش چی میتونه باشه؟
Err http://ppa.launchpad.net trusty/main amd64 Packages
404 Not Found
Err http://ppa.launchpad.net trusty/main i386 Packages
404 Not Found
W: GPG error: http://deb.opera.com stable InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 517590D9A8492E35
W: Failed to fetch http://ppa.launchpad.net/zhurikhin/primus/ubuntu/dists/trusty/main/binary-amd64/Packages 404 Not Found
W: Failed to fetch http://ppa.launchpad.net/zhurikhin/primus/ubuntu/dists/trusty/main/binary-i386/Packages 404 Not Found