Post-installation Notes on Ubuntu 16.04 LTS Xenial Xerus

Ubuntu 16.04 LTS Xenial Xerus was released few weeks back and its time to either upgrade or fresh installation. I've done both for different machine, my lappy and desktop. Since my recent switch to SSD hard disk and a new graphic card, these are my notes on the post-installation. After so many years of using Ubuntu, yet you still need to manually tweak it to get the basic essential features to work correctly.

Installation against the SSD is freaking fast, the whole installation finished merely in just less than five minutes. I didn't time the installation process but it was blazing fast compare to all my previous installation. If you're still using HDD, switch to SSD, now! Is like the connection speed from upgrading from dial-up to fiber optic.

Update and Upgrade Packages
The new apt command is very welcoming and finally we have progress bar during package installation. Before that, switch to your fastest mirror. No offence to those who helps to mirror MY repository, but MY mirrors speed are rather inconsistent compare to SG mirrors.
$ sudo sed -i 's/my/sg/g' /etc/apt/sources.list
$ sudo apt update
$ sudo apt full-upgrade

Replace Unity with Gnome
Yes, finally Unity's launcher can be moved to the bottom of the screen but is too little, too late for anyone to care about that. GNOME provides a better integrated desktop user experience. Pick GDM3 as your login manager, log off from current desktop sesison, switch to GNOME desktop, and re-login.
$ sudo apt install ubuntu-gnome-desktop

Dual-Screen Undetected Screen Resolution
Till today, Ubuntu still cannot get the screen resolution right for my second monitor. Again, we've to tweak it through xrandr.
$ xrandr -q
$ cvt 1280 1024

Add the resulting shell script '.xprofile' to resize and re-position the dual screen monitors as follows. As I'm a left-handed mouse user, hence my screen setup is also spanning from left to right.
xrandr --newmode Modeline "1280x1024_60.00"  109.00  1280 1368 1496 1712  1024 1027 1034 1063 \
    -hsync +vsync

xrandr --addmode DVI-0 1280x1024_60.00

xrandr --output VGA-0 --primary --mode 1280x1024 --pos 1280x0 --rotate normal \
    --output DVI-0 --mode 1280x1024_60.00 --pos 0x0 --rotate normal \
    --output HTMI-0 --off

Conventionally, to execute the command before the starting of X user session for GDM, you should put these commands in '.xprofile' as GDM will load the setting from '/etc/gdm3/Xsession'.

Google Chrome can't play YouTube's videos.
Beginning 16.04, there is no more proprietary ATI graphic driver or fglrx and this may cause some issues if hardware acceleration through graphic cards like games or video playing. The error message obtained when starting Google Chrome from the console as shown below.
Not implemented reached in virtual 
void cc::VideoLayerImpl::AppendQuads(cc::RenderPass *, cc::AppendQuadsData *)

The workaround is to disable hardware acceleration under 'advanced settings`. Mostly likely this will be fixed in upcoming patches.

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