Comment 3 for bug 558961

I got the same error.
This seems to be a bug in the package post-installation script . This one might be related:
https://bugzilla.redhat.com/show_bug.cgi?id=497098

dpkg -i -D163 --force-all /var/cache/apt/archives/gallery2_2.3-1ubuntu3_all.deb
[...]
D000100: process_archive ... found in gallery2

D000040: checking dependencies of gallery2 (- <none>)
D000040: ok 2 msgs >><<
D000040: checking Breaks
Setting up gallery2 (2.3-1ubuntu3) ...
D000001: deferred_configure updating conffiles
D000002: fork/exec /var/lib/dpkg/info/gallery2.postinst ( configure 2.3-1ubuntu3 )
ln: creating symbolic link `/usr/share/gallery2/lib/smarty': No such file or directory
dpkg: error processing gallery2 (--install):
 subprocess installed post-installation script returned error exit status 1
Errors were encountered while processing:
 gallery2