alsamixer
Go into the commandline, and run alsamixer. Scroll to the right until you reach mic, and makesure it's not muted and the volumes up (m mutes/unmutes), make sure 'mic boost' is on, and finally look at 'mic select' and make sure you've selected the correct mic(Mic1 is usually for the back plug and Mic2 would be for a front plug if you have one)
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