no ieee b/g/n and internet connection very slow

After installed ubuntu 16.04. The wlan is working using a build in driver, but the ieee configuration of b/g/n are not running after i install the ubuntu, but my wlan support b/g/n. I am using realtek mini-pci adapter and my driver is wlx7cc7095af019. Also the internet connection is very slow, how do i solve it.

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