How to cancel holding of a package

Question

I got a MID based on ubuntu os.The version if its software is pretty old.So I decide to upgrade the system.But apt-get upgrade does not work,it appears packages are prevented from upgrade.I can I unlock them

Thanks

Answer 1

Some packages (like the kernel) can only be upgraded with sudo apt-get dist-upgrade.

For pinned packages, have a look at the /etc/apt/preferences file and the files in the /etc/apt/preferences.d directory. Usually the file and directory is empty unless you've manually set values. Removing a file will then remove the pin.