My marshall code 25 making pup sound every 5 second 

I have tried everything 

update and resat and changing the paower cable 

nothing semes to make the sound go 

what should i do ? 

Hi!

Can I record sound connecting my Ubuntu Linux 18.04 via USB cable?

I think the Ubuntu does not recognize Marshall Code 25 as a recording device. I tried without success. Can you help, please?

Fábio Peruchi

Brazil