Hi @gabrieldsuarez,
please read the following link first:
Second, if you are planning to update to Ubuntu Mate 18.04 when released, you might get slightly better support for AMD/ATI GPU's.
If you want to download and test a live version of UM 18.04, go here:
You can upgrade your system if you want to using the following terminal command:
sudo do-release-upgrade -d
Read this first please:
There is no guarantee that an upgrade will solve your problem!. 