apt-get remove libwrt1 wrt-api-experimental wrt-experimental liblzma1
after that
apt-get -f install
apt-get install libwrt1 wrt-api-experimental wrt-experimental liblzma1(if you need those packages)

/home/user # apt-get remove libarchive1 libwrt-api1 qtwrt-experimental-wrt
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Couldn't find package qtwrt-experimental-wrt
sorry again
/home/user # apt-get remove libarchive1 libwrt-api1 qtwrt-experimental wrt
Reading package lists... Done
Building dependency tree
Reading state information... Done
You might want to run `apt-get -f install' to correct these:
The following packages have unmet dependencies:
wrt-api: Depends: wrt (= 1.1.0) but it is not going to be installed
Depends: libwrt-api1 (= 1.1.0) but it is not going to be installed
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).

you make a typo !

ok i will try alfreds now.

I didn't correct you...
My message came later

/home/user # apt-get remove libwrt1 wrt-api-experimental wrt-experimental liblzma1
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package libwrt1 is not installed, so not removed
Package wrt-api-experimental is not installed, so not removed
Package wrt-experimental is not installed, so not removed
You might want to run `apt-get -f install' to correct these:
The following packages have unmet dependencies:
libarchive1: Depends: liblzma1 (>= 4.999.9beta+20091116-1maemo1) but it is not going to be installed
libwrt-api1: Depends: libwrt1 (= 1.1.0) but it is not going to be installed
qtwrt-experimental: Depends: wrt-experimental (= 1.1tp-3) but it is not going to be installed
Depends: wrt-api-experimental (= 1.1tp-3) but it is not going to be installed
wrt: Depends: libwrt1 (= 1.1.0) but it is not going to be installed
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).
/home/user # apt-get -f install
Reading package lists... Done
Building dependency tree
Reading state information... Done
Correcting dependencies... Done
The following extra packages will be installed:
libwrt1 wrt-api-experimental wrt-experimental
The following NEW packages will be installed:
libwrt1 wrt-api-experimental wrt-experimental
0 upgraded, 3 newly installed, 0 to remove and 35 not upgraded.
1 not fully installed or removed.
Need to get 0B/853kB of archives.
After this operation, 3097kB of additional disk space will be used.
Do you want to continue [Y/n]?
(Reading database ... 27574 files and directories currently installed.)
Unpacking libwrt1 (from .../libwrt1_1.1.0_armel.deb) ...
dpkg: error processing /var/cache/apt/archives/libwrt1_1.1.0_armel.deb (--unpack):
trying to overwrite `/usr/lib/libWrtRuntimeCore.so.1.1.0', which is also in package libwrt-experimental1
dpkg-deb: subprocess paste killed by signal (Broken pipe)
Unpacking wrt-experimental (from .../wrt-experimental_1.1tp-3_armel.deb) ...
dpkg: error processing /var/cache/apt/archives/wrt-experimental_1.1tp-3_armel.deb (--unpack):
trying to overwrite `/etc/wrt/security/mapping.xml', which is also in package wrt-policy
dpkg-deb: subprocess paste killed by signal (Broken pipe)
Unknown media type in type 'sketch/png'

Unpacking wrt-api-experimental (from .../wrt-api-experimental_1.1tp-3_armel.deb) ...
dpkg: error processing /var/cache/apt/archives/wrt-api-experimental_1.1tp-3_armel.deb (--unpack):
trying to overwrite `/etc/wrt/api/wrtapicommlog.xml', which is also in package wrt-api
dpkg-deb: subprocess paste killed by signal (Broken pipe)
Errors were encountered while processing:
/var/cache/apt/archives/libwrt1_1.1.0_armel.deb
/var/cache/apt/archives/wrt-experimental_1.1tp-3_armel.deb
/var/cache/apt/archives/wrt-api-experimental_1.1tp-3_armel.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)

apt-get remove libwrt1 wrt-api-experimental wrt-experimental libarchive1 libwrt-api1 qtwrt-experimental wrt

yes but ill write wrong..

/home/user # apt-get remove libwrt1 wrt-api-experimental wrtReading package lists... Donewrt-api1 qtwrt experimental wrtBuilding dependency tree
Reading state information... Done
Package libwrt1 is not installed, so not removed
Package wrt-api-experimental is not installed, so not removed
Package wrt-experimental is not installed, so not removed
Package qtwrt is not installed, so not removed
E: Couldn't find package experimental

Now
apt-get -f install