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My device is dell Vostro 3400,FIrstly i have installed ubuntu 18,i found audio is not working,iI have upgraded to ubuntu 20 same problem here too

eg flag

My device is dell Vostro 3400,FIrstly i have installed ubuntu 18,i found audio is not working,iI have upgraded to ubuntu 20 same problem here too and even brighness is not adjustable.please help me out.

gq flag
Welcome to Askubuntu. Please ask one question (audio/brightness) at a time and try to add relevant details to get relevant answers.
Will avatar
id flag
We’ll need more details - hardware, full version of Ubuntu - to try to help.
guiverc avatar
cn flag
Ubuntu has both releases using *yy* format (they are *snap* only specialist releases) and releases using the *yy.mm* format (which are *deb* based but can use *snap* packages too). So you're asking about a Ubuntu Core 18 product that was upgraded to Ubuntu Core 20? as that's a different system to Ubuntu 20.04 LTS (Ubuntu Cor 18 & 20 are designed for *headless* operation in servers)
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