Hello! i'am so thankful of your help, i think that this problem just happened after i made an update !
I can't install any app even the deb file !
and i have this error messages with i paste from the log file of appmanager ( i tried also the default application manager , the same problem)

Start reading package lists
--- 2011-07-11 03:41:36 ---
Finished reading package lists
--- 2011-07-11 03:41:36 ---
Start fetching package dates
--- 2011-07-11 03:41:36 ---
need to fetch date for 0 packages
--- 2011-07-11 03:41:36 ---
sent 0 requests, received 0 replies with 0 errors
--- 2011-07-11 03:41:36 ---
Finished fetching package dates
--- 2011-07-11 03:42:12 ---
/usr/bin/apt-get -qsy --allow-unauthenticated -o Dir::Etc::sourcelist=/opt/fapman-cache/sources.list -o Dir::State::lists=/opt/fapman-cache/lists -o Dir::Etc::sourceparts="" --auto-remove install 15shki
--- 2011-07-11 03:42:16 ---
Output from last process:
---
Reading package lists...
Building dependency tree...
Reading state information...
You might want to run `apt-get -f install' to correct these:
The following packages have unmet dependencies:
openssh-client: Depends: openssh-common but it is not going to be installed
openssh-server: Depends: openssh-common (= 1:5.1p1-6.maemo5) but it is not going to be installed
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).