I can confirm this problem using the main repo:
$ apt-cache policy wesnoth
wesnoth:
Installed: (none)
Candidate: 1:1.4-1~gutsy1
Version table:
1:1.4-1~gutsy1 0
500 http://archive.ubuntu.com gutsy-backports/universe Packages
1.2.6-1ubuntu2.4 0
500 http://archive.ubuntu.com gutsy-updates/universe Packages
500 http://archive.ubuntu.com gutsy-security/universe Packages
1.2.6-1ubuntu2 0
500 http://archive.ubuntu.com gutsy/universe Packages
$ apt-cache policy wesnoth-data
wesnoth-data:
Installed: 1:1.2.8-1~gutsy1
Candidate: 1:1.2.8-1~gutsy1
Version table:
*** 1:1.2.8-1~gutsy1 0
500 http://archive.ubuntu.com gutsy-backports/universe Packages
100 /var/lib/dpkg/status
1.2.6-1ubuntu2.4 0
500 http://archive.ubuntu.com gutsy-updates/universe Packages
500 http://archive.ubuntu.com gutsy-security/universe Packages
1.2.6-1ubuntu2 0
500 http://archive.ubuntu.com gutsy/universe Packages
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wesnoth in gutsy-backports does not have required dependency
https://bugs.launchpad.net/bugs/209463
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