How to uninstall steam64 for linux/ubuntu?
Solution 1:
sudo apt-get purge steam-launcher && sudo apt-get autoremove
Post any errors to recieve further assistance.
Solution 2:
Try installing Synaptic Package Manager with sudo apt-get install synaptic, then open the program and search for steam. Click the little button next to it and/or other packages you wish to remove and mark it/them for complete removal, then press Apply. This generally does a more thorough job of removing applications.