1. first, apt-get remove/purge 0.9.30.4 package. To list installed deb file/files execute, dpkg -l | grep -i lazarus.
2. get the fpc and lazarus deb files from the Snapshot.
3. untar fpc first.
4. dpkg -i fp*.deb
5. untar lazarus tar file.
6. like in step 4 install lazarus packages.
7. if it gives dependency error, use apt-get install <package_name> to install dependency packages.
8. end of the story.
