sudo do-release-upgrade Checking for new Ubuntu release Get Upgrade to

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$ sudo do-release-upgrade
Checking for a new Ubuntu release
Get:1 Upgrade tool signature [198 B]
Get:2 Upgrade tool [1 147 kB]
Fetched 1 148 kB in 0s (0 B/s)
authenticate 'utopic.tar.gz' against 'utopic.tar.gz.gpg'
extracting 'utopic.tar.gz'
...