I am a Nokia 770 newbie myself and have spent a frustrating sunday trying to set it up to boot off the MMC. I had issues with ALL the installs and had to use the Red Pill (How bloody stupid is this red pill thing ?) method to install e2fsprogs. Unfortunately this did not work for : apt-get -d install tar which also gave me unable to find issues. When I tried the Red Pill method it informed me that there was a conflict with something else. Eventually what I did was THIS : In a browser I downloaded the offending file to the documents folder - that file being here : http://repository.maemo.org/pool/mae...osso_armel.deb
After that I moved the file to /tar-temp using this command :
mv /home/user/MyDocs/.documents/tar_1.14-2.1osso_armel.deb /tar-temp/tar_1.14-2.1osso_armel.deb
changed directory to /tar-temp and restarted this process with :
dpkg -x tar*.deb /tar-temp/
tar cf - -C /floppy . | /tar-temp/bin/tar xvf - -C /opt
........... at this time it is still copying files ........................

Thank y'all for the red pill tip ................ (What a crock) Ostin.