Ubuntu – Solutions for running Dropbox on Ubuntu 16.04 with some kind of encryption

If there were any plans to change the default filesystem, they would be part of the blueprints for 16.04. As you can see, the list of blueprints is rather threadbare compared to the those of 15.10 or 14.04, so I guess things haven't really settled yet. So, if there are plans, they aren't "official" yet.

The last time this was discussed in ubuntu-devel was in April 2015. To quote an Ubuntu kernel dev, Colin King:

After a lot of thorough testing over the past several months, I still deem btrfs as experimental quality. There are still issues that can't be easily recovered from, so personally, I don't recommended it quite yet for a default filesystem.

So, in conclusion:

There are no plans to change the default filesystem.

Well I recommend to upgrade your kernal version to Kernal 4.6.4 and then download the latest wifi driver from git rtlwifi_new. Now go inside the downloaded directory and compile as follows.

sudo make

sudo make install

sudo reboot

Now try loading the driver modules

sudo modprobe -r rtl8821ae
sudo modprobe rtl8821ae

Scan the wifi and check the quality level using the following command.

iwlist scan | egrep -i 'ssid|level'

If still your problem persist then need to check how many antennas your laptop have and try changing antenna (ant_sel)and check the quality level of the signal.

sudo modprobe -r rtl8821ae
sudo modprobe rtl8821ae ant_sel=1
iwlist scan | egrep -i 'ssid|level'

if not try second antenna as follows.

sudo modprobe -r rtl8821ae
sudo modprobe rtl8821ae ant_sel=2
iwlist scan | egrep -i 'ssid|level'

if any of the above antenna switching works, then make it permanent by adding options correct ant_sel= to a conf file by creating it as follows.

options rtl8821ae ant_sel=1

If everything goes fine, then reboot and enjoy.