Comment 11 for bug 129518

Always reproducible, as I can also confirm.

The workround of downloading glabels_2.1.3-3-xxxxx and glabels-data_2.1.3-3-xxxxx as described by mtwells didn't work for me:
$ sudo dpkg -i glabels_2.1.3-3_amd64.deb glabels-data_2.1.3-3_all.deb
dpkg: error processing glabels_2.1.3-3_amd64.deb (--install):
 cannot access archive: No such file or directory
dpkg: error processing glabels-data_2.1.3-3_all.deb (--install):
 cannot access archive: No such file or directory
Errors were encountered while processing:
 glabels_2.1.3-3_amd64.deb
 glabels-data_2.1.3-3_all.deb

I found another workround.

From the command line, run gconf-editor.
In the left-hand pane, select apps, then glabels.
In the right-hand pane, select default-page-size and change the value from US-Letter to Other.
Quit gconf-editor.
Start glabels. You shoul dnow be able to use templates based on other page sizes.

K.