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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

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A bit more information could be useful... – RobinJ Feb 22 '12 at 13:03
up vote 3 down vote accepted

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.

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what if that file and folder are empty? How do I unhold it then? and should I? refering to: askubuntu.com/questions/449399/… – rubo77 Apr 18 '14 at 2:38

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