For those looking for vmware-player in the last version of ubuntu, you wont find it it was removed.

But you can install it from a ppa repo.

Add these lines to your /etc/apt/sources.list

deb http://ppa.launchpad.net/cschieli/ubuntu gutsy main restricted universe multiverse
deb-src http://ppa.launchpad.net/cschieli/ubuntu gutsy main restricted universe multiverse

Then update,

sudo aptitude update

Finally, install

sudo aptitude install vmware-player

After installation you will probably want to comment that repo.