This looks like a regression from this change:
dhcp3 (3.0.4-12ubuntu2) feisty; urgency=low
* Add debian/patches/dynamic-hostname.dpatch:
- Add support for a new string type 'h' which behaves like 't' except
that '<hostname>' is changed to the current hostname.
- Change 'host-name' DHCP option type from 't' to 'h'.
- Based on a patch from Nathan O'Sullivan, thank you!
* debian/dhclient.conf: Enable send-hostname by default (value '<hostname>',
which our shiny new patch from above will translate to the actual
hostname). Closes: LP#10239 and two handful of duplicates.
** Changed in: dhcp3 (Ubuntu)
Importance: Undecided => High
Assignee: (unassigned) => Martin Pitt
Status: Unconfirmed => In Progress
--
dhclient: format_min_length(h): No safe value for unknown format symbols.
https://launchpad.net/bugs/87816
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