Debain OS upgrades

Hi

Currently the command used for remote OS Upgrade on debian systems is

exec("aptitude update");
exec("aptitude safe-upgrade -y");

This has one issue: Under some circumstances aptitude might request interactive input even though -y is set. I ovvure this on two servers from time to time.

apt-get has a near equivalent to safe-upgrade. apt-get upgrade is even more safe to be serious.

I suggest changing the code to execute

exec("apt-get update");
exec("apt-get upgrade -y");

If you like this idea I will change and do a merge request