Okay..I didnt get JOdin running correctly (still getting corrupted pit file message), but I got my device rooted via heimdall frontend (thanks to zibrah3ed)
If other linux users are having trouble rooting their devices - you can try this:
1.) download T210.CWM.126.96.36.199.recovery.tar.zip and android-armeabi-universal-root-signed.zip from here
2.) copy android-armeabi-universal-root-signed.zip to internal or external sdcard of device
3.) decompress T210.CWM.188.8.131.52.recovery.tar.zip (should give you recovery.tar.md5)
4.) rename recovery.tar.md5 to recovery.tar.gz
5.) decompress recovery.tar.gz (now you should have a file named recovery.img)
6.) put device into download mode with "home+vol down+power" and connect it
7.) verify device is detected via terminal:
# heimdall detect
8.) download pit file from your device via terminal:
# heimdall download-pit --output smt210.pit
(file is saved at the current folder you are situated in the terminal)
9.) let device auto-reboot, then reenter download mode
10.) start heimdall-frontend (I did it with gksudo heimdall-frontend) and click "Detect" (@Utilities tab of Heimdall)
11.) click on Flash tab of Heimdall
12.) browse for the downloaded pit file (@Options PIT)
Make sure "Repartition" is NOT checked/selected
13.) click on "Add" (@Partitions (Files))
14.) change Partition Name to RECOVERY (@Partition Details)
15.) browse for the decompressed recovery.img (@File (recovery.img))
16.) uncheck "No Reboot" & "Resume"
17.) hit start
18.) the device will automatically reboot when finished...
19.) turn off the device and press "home+vol up+power", when the Samsung logo shows up release power button but keep pressing "vol up+home" until you enter CWM Recovery mode (takes little while)
20.) install zip android-armeabi-universal-root-signed.zip (the navigation is a littlebit weird, but well explained here
21.) reboot device
After the reboot my PlayStore was broken (displaying "no connection" although I was able to surf on websites in the browser)
Doing a factory reset in CWM Recovery mode helped and I was able to install Superuser.
Would be cool if I get JOdin running because its easier to handle.. but I have no idea how.
Anyways I think this problem is more releated to JOdin thread
so mods feel free to close this one.