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I inadvertently updated my Linux kernel to version 4.2.0-30 from 3.19.0-33 and it has broken my WiFi and USB drivers, is there a way for me to downgrade my kernel using some sort of cached version?
Run sudo apt-get purge linux-image-4.2.0-30-generic in terminal to remove the new 4.2 kernel.Then reboot
sudo apt-get purge linux-image-4.2.0-30-generic
WARNING : If you have removed your old kernel using apt-get or synaptic this can result in an unbootable computer
You really do not need to do this right now
when booting ...
at this point see if the WiFi and USB work
If so THEN you can remove the kernel if it bothers you
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