Have you ever face this issue? this is a precaution to prevent of the server being break.
How to deal with it? Fortunately, it is simple. We can use tool of
aptitude to upgrade what's being kept back.
First we need to install it if you don't have it already:
sudo apt-get install aptitude -y
then we can upgrade them by this command:
sudo aptitude safe-upgrade
Voila, we have upgrade them.