New answers tagged restore
There is no officially supported way to downgrade. Anyway, it would be buggy. You will eventually spend less time to reinstall.
It is unlikely that you system is usable after removing the /lib directory, since this contains the runtime linker (e.g., /lib/x86_64-linux-gnu/ld-2.21.so). Without this file you will not be able to run any dynamically linked binaries (which, in general, means everything). Any attempt to restore these directories is probably going to be complex and error ...
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