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How to fix Bluetooth issue? Bluetooth disabled after Ubuntu 13.10 update.

(1) Just to unblock resource.

$ sudo rfkill unblock bluetooth

Ubuntu 13.10 – How to download Youtube video in command line?

(1) Install youtube-dl:
$ sudo apt-get install youtube-dl

(2) Download in command line:
$ youtube-dl “youtube URL”

(1) Install or re-install indicator-datetime:

$ sudo apt-get install indicator-datetime

(2) Re-configure the date/time:

$ sudo dpkg-reconfigure -f noninteractive tzdata

(3) Restart unity service:

sudo killall unity-panel-service

(4) Launch “System Setting” > “Time & Date” > “Clock” Tab.
Check “Show a clock in the menu bar”.