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my problem is my Raspbian (with PREEMPT-RT patch) is freezing after performing sudo apt-get update.

Is there any logs or anyway to know what happened to Raspbian after this update. so that I can figure out what makes conflict with the PREEMPT-RT patch.

p.s: in Raspberry website it is mentioned that downloaded package files (.deb files) are kept in /var/cache/apt/archives. but I believe that there are other changes in the system that caused this freezing.

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  • "I believe that there are other changes in the system" -> I'm almost positive that one way or another this could be deduced from the list of modified packages, although the worst case scenario I have in mind is pretty ugly as it involves scanning the packages themselves. You might take your awareness of this and ask a more specific question about that on Unix & Linux, since the package management system is not unique to the pi and is used on a very wide variety of (possibly even most) GNU/Linux systems. – goldilocks♦ Sep 13 '16 at 12:36
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    As always, make a backup before performing a change you don't know how to undo. – Dmitry Grigoryev Jul 3 at 12:41
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From apt-get manpage:

update is used to resynchronize the package index files from their sources.

It only updates what is available, it does not make any changes to your system!

Perhaps you are thinking "upgrade"? The answer to that is available on UNIX StackExchange.

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