I have posted the .deb of meshmixer 2.9 on the linux download page: http://www.meshmixer.com/linux.html
We have actually had this live on the server for a while, so if you happened to do an apt update, you might have already downloaded 2.9
This version has the same functionality as meshmixer 2.9 for Win/OSX. Many bugs have been fixed. We did just release mm 2.9.1 for Win/OSX, possibly that update will come soon.
Unfortunately this is still for 14.04, we have not managed to update it for more recent versions of Ubuntu. However we did make some improvements:
1) meshmixer now automatically sets up your <home_dir>/meshmixer/ folder on startup, so it is not necessary to manually install the documents folder
2) we (hopefully) made many of the .deb improvements that were posted by users in the forum.
We have not done a lot of testing of this, so please if you have any problems, or suggestions, post them in this thread.