E: Unable to locate package gcc-5-bas
root@ubuntu:/# sudo apt install --reinstall gcc-5-base
sudo: unable to resolve host ubuntu
Reading package lists... Done
Building dependency tree       
Reading state information... Done
You might want to run 'apt-get -f install' to correct these:
The following packages have unmet dependencies:
 libstdc++6:i386 : Depends: gcc-5-base:i386 (= 5.4.0-6ubuntu1~16.04.4) but it is not going to be installed
N: Ignoring file '50unattended-upgrades.ucf-old' in directory '/etc/apt/apt.conf.d/' as it has an invalid filename extension
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).
root@ubuntu:/# sudo apt install --reinstall gcc-5-base