WiFi connection doesn't work in Ubuntu 16.04

I've installed Ubuntu 16.04 on my laptop, WiFi connection doesn't work, after searching I found that run following commands and then restart the machine solve the problem.

sudo apt-get install firmware-b43-installer
sudo apt-get purge bcmwl-kernel-source

But this issue happened each time I shutdown the machine. So, it's not reliable to do this each time!!

Update: Output of grep b43 /etc/modprobe.d/* command is:

/etc/modprobe.d/blacklist.conf:# replaced by b43 and ssb

Output of rfkill list command is:

0: acer-wireless: Wireless LAN
    Soft blocked: no
    Hard blocked: no
1: phy0: Wireless LAN
    Soft blocked: no
    Hard blocked: no