sudo apt-get update, I see this error
( W: Failed to fetch http://ppa.launchpad.net/upubuntu-com/multimedia/ubuntu/dists/trusty/main/binary-i386/Packages 404 Not Found).
How to solve my problems?
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You need to remove that repository as it no longer exists.
Here is a related question that should help you
The ppa does not provide packages for trusty. Take a look at your url
To hide/resolve the error, you should remove the ppa from Software Sources. I recommend using Y PPA Manager, it is handy.
If you need to install the packages provided by the ppa for trusty, you can check to see whether you can forcibly use a package from older distributions provided they work.