So what happens when you try to (re-)get 'python2.5-cairo'?

For me, it appears to be a valid selection, even though I already have it:

Nokia-N800-23-14:~# apt-get install python2.5-cairo
Reading package lists... Done
Building dependency tree
Reading state information... Done
python2.5-cairo is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 3 not upgraded.

When I recently reflashed and re-installed everything, the 'python' packages that I had to re-request were:

python2.5
python2.5-runtime
python2.5-dev
python2.5-gpsbt
python2.5-hildondesktop

Since I did not (apparently) explicitly ask for 'python2.5-cairo', I suppose it was included in one of the other requests.