Installing RVM: getting error "There was an error(23)."
Your RVM is installed in /usr/local/rvm - it's often called system installation, this requires that your user ubuntu will be added to rvm group:
rvm group add rvm "$USER"yes use $USER it will be replaced by your shell with your user name
then log out and log in, ensure with:
idthat your user is in rvm group,
finally just in case update permissions for RVM:
rvm fix-permissions
The solution by @mpasis might not work if you're installing rvm using ubuntu_rvm as by default because of copy+paste it'll be installed as root.Try installing rvm with without sudo or with curl as explained on rvm.io.