This looks good to me for yakkety.
bdmurray@clean-xenial-amd64:~$ do-release-upgrade -p --frontend DistUpgradeViewText Checking for a new Ubuntu release Get:1 Upgrade tool signature [836 B] Get:2 Upgrade tool [1,258 kB] Fetched 1,259 kB in 0s (0 B/s) authenticate 'yakkety.tar.gz' against 'yakkety.tar.gz.gpg' extracting 'yakkety.tar.gz' [screen is terminating]
bdmurray@clean-xenial-amd64:/tmp/ubuntu-release-upgrader-3n2e_3cn$ gpg --list-packets yakkety.tar.gz.gpg gpg: keyring `/home/bdmurray/.gnupg/secring.gpg' created gpg: keyring `/home/bdmurray/.gnupg/pubring.gpg' created :signature packet: algo 1, keyid 3B4FE6ACC0B21F32 version 4, created 1480470386, md5len 0, sigclass 0x00 digest algo 10, begin of digest 76 73 hashed subpkt 2 len 4 (sig created 2016-11-30) subpkt 16 len 8 (issuer key ID 3B4FE6ACC0B21F32) data: [4093 bits]
This looks good to me for yakkety.
bdmurray@ clean-xenial- amd64:~ $ do-release-upgrade -p --frontend DistUpgradeViewText tar.gz. gpg'
Checking for a new Ubuntu release
Get:1 Upgrade tool signature [836 B]
Get:2 Upgrade tool [1,258 kB]
Fetched 1,259 kB in 0s (0 B/s)
authenticate 'yakkety.tar.gz' against 'yakkety.
extracting 'yakkety.tar.gz'
[screen is terminating]
bdmurray@ clean-xenial- amd64:/ tmp/ubuntu- release- upgrader- 3n2e_3cn$ gpg --list-packets yakkety.tar.gz.gpg bdmurray/ .gnupg/ secring. gpg' created bdmurray/ .gnupg/ pubring. gpg' created
gpg: keyring `/home/
gpg: keyring `/home/
:signature packet: algo 1, keyid 3B4FE6ACC0B21F32
version 4, created 1480470386, md5len 0, sigclass 0x00
digest algo 10, begin of digest 76 73
hashed subpkt 2 len 4 (sig created 2016-11-30)
subpkt 16 len 8 (issuer key ID 3B4FE6ACC0B21F32)
data: [4093 bits]