Still same error, 1 minute ago.

Nokia-N900-42-11:~# apt-get install yappari
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages will be upgraded:
yappari
1 upgraded, 0 newly installed, 0 to remove and 34 not upgraded.
Need to get 5857kB of archives.
After this operation, 32,8kB of additional disk space will be used.
Get:1 http://repository.maemo.org fremantle-1.3/free yappari 2.0.12 [5857kB]
Fetched 5857kB in 14s (416kB/s)
Failed to fetch http://repository.maemo.org/extras-d...0.12_armel.deb Size mismatch
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?
Nokia-N900-42-11:~#