Looks good for xenial too:
bdmurray@upgrade-trusty-amd64:~$ do-release-upgrade -p --frontend
DistUpgradeViewText
Checking for a new Ubuntu release
Get:1 Upgrade tool signature [836 B]
Get:2 Upgrade tool [1,266 kB]
Fetched 1,267 kB in 0s (0 B/s)
authenticate 'xenial.tar.gz' against 'xenial.tar.gz.gpg'
extracting 'xenial.tar.gz'
[screen is terminating]
bdmurray@upgrade-trusty-amd64:~$ gpg --list-packets
/tmp/ubuntu-release-upgrader-xbbg9wzd/xenial.tar.gz.gpg
gpg: directory `/home/bdmurray/.gnupg' created
gpg: new configuration file `/home/bdmurray/.gnupg/gpg.conf' created
gpg: WARNING: options in `/home/bdmurray/.gnupg/gpg.conf' are not yet active
during this run
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 1480546800, md5len 0, sigclass 0x00
digest algo 10, begin of digest bb e2
hashed subpkt 2 len 4 (sig created 2016-11-30)
subpkt 16 len 8 (issuer key ID 3B4FE6ACC0B21F32)
data: [4095 bits]
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https://bugs.launchpad.net/bugs/1645906
Title:
new dist-upgrader tarballs necessary so they are signed with 4k key
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