Comment 48 for bug 195483

Grip never used to work at all well, which is why I guess that it's no longer in the current repository. I don't know about Ruby Ripper, which I gather needs creating from source, never a certain outcome process with Ubuntu, success varying between versions.
Meanwhlie, if you are into compilation, why not produce a Lucid deb file for EncSpot, whose tar file was released just before the originators 'closed shop' ?
On the other hand, you could simply add checkmp3 and run it in Terminal against your mp3s, where it provides a better and more comprehensive report than other tools etc that folk have been using and whose report details just happen to completely agree with WinXP-hosted EncSpot analysis of my Sound-Juicer produced VBR files.