I recently installed Linux Mint 18 on my laptop just two days ago (first linux experience) but because of a booting issue, I had to reinstall it again yesterday.
The networking was working flawlessly on my first install when I used the software switch (right clicking the wifi icon and click "enable networking") to switch on/off the wireless connection. This feature is really important for me because I use it a lot in college so I can save battery life. The only annoying thing was that the bluetooth networking was set "on" by default on every startup, which I had to manually switch off every time.
However since I reinstalled Mint yesterday, I seem to have a network manager issue. On boot, the wifi seems to work perfectly: I have four black bars icon in the toolbar and right-clicking shows all wifi networks available in the surroundings. However, when I switch wifi off then back on, the available wifi networks list shows empty (or only one network shows up) but my computer still automatically connects to my home's network which is already registered.
Strangely, the icon on the toolbar shows the wired connection icon and not the wireless icon (or sometimes it shows the wireless one with four empty bars, but I still can surf).
After switching on/off several times, the wifi eventually shows "device not ready" and doesn't even connect to my network. I have to restart the computer to make it work. However, one strange thing is that the bluetooth is actually disabled on boot if I didn't use it which is nice and not automatically enabled like on my first install.
This issue is particularly strange since I didn't have it on my first Mint install, which was identical: the only difference in installation is that I was connected to the wifi during the installation the second time which may have downloaded some softwares.
I have fully updated my computer. I don't really know about the drivers, my wifi card is an Intel Dual Band Wireless-AC 3160 and i have downloaded their linux driver and put the "iwlwifi-3160-14.ucode" in /lib/firmware. Didn't seem to do anything. My driver manager only shows my CPU and nothing else so I can't configure my wireless drivers. Anyways, didn't seem to have changed anything.
For now, if I use
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sudo service network-manager restart
Anyways, thank you for reading, I will put some images if it is not clear enough
And sorry if my grammar is kind of broken, I'm not native English speaker.