attila77: well, the errors are different now. The bold part is the heart of the problem (emphasis mine).

The following NEW packages will be installed
dmsetup kernel-diablo-modules-dmloop libdevmapper1.02.1
The following packages will be upgraded:
easy-chroot
1 upgraded, 3 newly installed, 0 to remove and 116 not upgraded.
Need to get 89.0kB/246kB of archives.
After unpacking 381kB of additional disk space will be used.
Do you want to continue [Y/n]? y
WARNING: The following packages cannot be authenticated!
libdevmapper1.02.1 dmsetup kernel-diablo-modules-dmloop easy-chroot
Install these packages without verification [y/N]? y
Get: 1 http://repository.maemo.org diablo/free libdevmapper1.02.1 2:1.02.27-maemo2 [52.0kB]
Get: 2 http://repository.maemo.org diablo/free dmsetup 2:1.02.27-maemo2 [37.0kB]
Fetched 89.0kB in 1s (85.5kB/s)
(Reading database ... 26889 files and directories currently installed.)
Unpacking libdevmapper1.02.1 (from .../libdevmapper1.02.1_2%3a1.02.27-maemo2_armel.deb) ...
Replacing files in old package easy-chroot ...
Unpacking dmsetup (from .../dmsetup_2%3a1.02.27-maemo2_armel.deb) ...
Replacing files in old package easy-chroot ...
Selecting previously deselected package kernel-diablo-modules-dmloop.
Unpacking kernel-diablo-modules-dmloop (from .../kernel-diablo-modules-dmloop_2.6.21-200842maemo1.3_armel.deb) ...
Preparing to replace easy-chroot 0.1.9 (using .../easy-chroot_0.2.2-1diablo1_armel.deb) ...
Unpacking replacement easy-chroot ...
Setting up libdevmapper1.02.1 (2:1.02.27-maemo2) ...
ldconfig: /usr/lib/libgailutil.so.18 is not a symbolic link

Setting up dmsetup (2:1.02.27-maemo2) ...
ln: /etc/udev/rules.d/65_dmsetup.rules: File exists
dpkg: error processing dmsetup (--configure):
subprocess post-installation script returned error exit status 1
Setting up kernel-diablo-modules-dmloop (2.6.21-200842maemo1.3) ...
dpkg: dependency problems prevent configuration of easy-chroot:
easy-chroot depends on dmsetup; however:
Package dmsetup is not configured yet.
dpkg: error processing easy-chroot (--configure):
dependency problems - leaving unconfigured
Errors were encountered while processing:
dmsetup
easy-chroot
E: Sub-process /usr/bin/dpkg returned an error code (1)