Nokia-N900:~# apt-get install libxml2=2.6.32.dfsg-5maemo4+0m5+0cssu1+thumb0
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages were automatically installed and are no longer required:
  libcpaboutcssu
Use 'apt-get autoremove' to remove them.
Recommended packages:
  xml-core
The following packages will be DOWNGRADED:
  libxml2
0 upgraded, 0 newly installed, 1 downgraded, 0 to remove and 7 not upgraded.
1 not fully installed or removed.
Need to get 724kB of archives.
After this operation, 36,9kB disk space will be freed.
Do you want to continue [Y/n]? y
Get:1 http://maemo.merlin1991.at fremantle/free libxml2 2.6.32.dfsg-5maemo4+0m5+0cssu1+thumb0 [724kB]
Fetched 724kB in 1s (697kB/s)
dpkg - warning: downgrading libxml2 from 2.6.32.dfsg-5maemo4+0m5+0cssu0-thumb0 to 2.6.32.dfsg-5maemo4+0m5+0cssu1+thumb0.
(Reading database ... 47783 files and directories currently installed.)
Preparing to replace libxml2 2.6.32.dfsg-5maemo4+0m5+0cssu0-thumb0 (using .../libxml2_2.6.32.dfsg-5maemo4+0m5+0cssu1+thumb0_armel.deb) ...
Unpacking replacement libxml2 ...
Setting up hildon-application-manager (1:2.2.72-5+thumb0) ...
Unknown media type in type 'sketch/png'

Setting up libxml2 (2.6.32.dfsg-5maemo4+0m5+0cssu1+thumb0) ...