.
А что, убунта опять сломала свои репозитории?
W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: security.ubuntu.com trusty-security Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key
gpg: requesting key 437D05B5 from hkp server keyserver.ubuntu.com
gpg: key 437D05B5: "Ubuntu Archive Automatic Signing Key " not changed
gpg: Total number processed: 1
gpg: unchanged: 1
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