Unmet dependencies libc++ [duplicate]
There is no package called libc++. It is libc++1.
So run the command as :
sudo apt-get install libc++1 multiarch-support libc6 libc++-dev libc++-helpers libc++-test libc++abi-dev libc++abi-test libc++abi1
Firstly type 'sudo apt-get -f install'. This will try to fix broken dependencies. If this ends up 'and x not upgraded', then type the following afterwards: 'sudo apt-get dist-upgrade'. This last command might install some new packages, so be careful.