Here is what happened:

Nokia-N900:~# apt-get install opendune
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following extra packages will be installed:
bzip2
The following NEW packages will be installed:
bzip2 opendune
0 upgraded, 2 newly installed, 0 to remove and 17 not upgraded.
Need to get 243kB of archives.
After this operation, 631kB of additional disk space will be used.
Do you want to continue [Y/n]? Y
WARNING: The following packages cannot be authenticated!
bzip2
Install these packages without verification [y/N]? y
Get:1 http://maemo.muarf.org ./ bzip2 1:1.0.5-3+0m5 [51.5kB]
Get:2 http://repository.maemo.org fremantle/free opendune 0.7.2555-maemo9 [192kB]
Fetched 243kB in 3s (65.9kB/s)
Selecting previously deselected package bzip2.
(Reading database ... 37880 files and directories currently installed.)
Unpacking bzip2 (from .../bzip2_1%3a1.0.5-3+0m5_armel.deb) ...
Selecting previously deselected package opendune.
Unpacking opendune (from .../opendune_0.7.2555-maemo9_armel.deb) ...
Setting up bzip2 (1:1.0.5-3+0m5) ...
Setting up opendune (0.7.2555-maemo9) ...
ln: /opt/maemo/usr/share/games/opendune/data: No such file or directory
dpkg: error processing opendune (--configure):
subprocess post-installation script returned error exit status 1
Errors were encountered while processing:
opendune
E: Sub-process /usr/bin/dpkg returned an error code (1)
Nokia-N900:~#