can't install libc6 package

Do

sudo apt-get autoclean
sudo apt-get update
sudo apt-get upgrade
sudo apt-get -u dist-upgrade

Then run

sudo dpkg --configure -a
sudo apt-get -f install

If it works, then fine. or again try doing

sudo apt-get install libc6-i386

One possible cause of unmet dependencies could be corrupted package database, and/or some packages weren’t installed properly. To fix this problem, hit Alt+Ctrl+T to open terminal and try to run one of the following commands:

sudo apt-get clean

or,

sudo apt-get autoclean

apt-get clean clears out the local repository of retrieved package files (the .deb files). It removes everything but the lock file from /var/cache/apt/archives/ and /var/cache/apt/archives/partial/. apt-get autoclean clears out the local repository of retrieved package files, but unlike apt-get clean, it only removes package files that can no longer be downloaded, and are largely useless.

One of the most basic fixes to resolve dependencies problems is to run:

sudo apt-get -f install

The -f here stands for “fix broken”. Apt will attempt to correct broken dependencies. If you manually installed a package that had unmet dependencies, apt-get will install those dependencies, if possible, otherwise it may simply remove the package that you installed in order to resolve the problem.

Then run:

sudo dpkg --configure -a

Then run this again:

sudo apt-get -f install

Reference: #https://askubuntu.com/questions/140246/how-do-i-resolve-unmet-dependencies-after-adding-a-ppa