Você pode verificar:
$ do-release-upgrade -c
Checking for a new Ubuntu release
New release '17.04' available.
Run 'do-release-upgrade' to upgrade to it.
Ou execute a atualização e cancele:
$ do-release-upgrade
Checking for a new Ubuntu release
Get:1 Upgrade tool signature [836 B]
Get:2 Upgrade tool [1,268 kB]
Fetched 1,269 kB in 0s (0 B/s)
authenticate 'zesty.tar.gz' against 'zesty.tar.gz.gpg'
extracting 'zesty.tar.gz'
[sudo] password for muru:
Está claro, a partir de ambas as saídas, que eu vou ser atualizado para o 17.04 ( zesty
).