Download from YouTube

best quality download :

youtube-dl youtube-dl -f "best" http://www.youtube.com/watch?v=P9pzm5b6FFY
youtube-dl -f best https://www.youtube.com/playlist?list=PLCuRg51-gw5VqYchUekCqxUS9hEZkDf6l
youtube-dl -f "bestvideo[width>=720]+bestaudio" https://www.youtube.com/watch?v=OHvY1DUxzfo&index=3&list=PLCuRg51-gw5VqYchUekCqxUS9hEZkDf6l
pip install --upgrade youtube_dl

References :

https://rg3.github.io/youtube-dl/
http://askubuntu.com/questions/486297/how-to-select-video-quality-from-youtube-dl

Xamarin.Android Intellisense not working in Visual Studio

You can get those files from the above links, Just download it and those files move it manually to C:\Program Files (x86)\Microsoft Visual Studio 12.0\Xml\Schemas or simply just add these schemas within Visual Studio.

https://github.com/atsushieno/monodroid-schema-gen/blob/master/android-layout-xml.xsd
https://github.com/atsushieno/monodroid-schema-gen/blob/master/schemas.android.com.apk.res.android.xsd

References :

http://stackoverflow.com/questions/17245308/xamarin-android-intellisense-not-working-in-visual-studio-2010
https://forums.xamarin.com/discussion/60962/enable-intellisense-for-axml-missing-android-layout-xml-xsd-schemas-android-com-apk-res-androiod

aria2 – Getting Started

Download from WEB:

$ aria2c http://example.org/mylinux.iso

Download from 2 sources:

$ aria2c http://a/f.iso ftp://b/f.iso

Download using 2 connections per host:

$ aria2c -x2 http://a/f.iso

BitTorrent:

$ aria2c http://example.org/mylinux.torrent

BitTorrent Magnet URI:

$ aria2c http://example.org/mylinux.torrent

Metalink:

$ aria2c http://example.org/mylinux.metalink

Download URIs found in text file:

$ aria2c -i uris.txt

References :
https://aria2.github.io/

Repair, Restore, or Reinstall Grub 2 with a Ubuntu Live CD or USB

sudo mount /dev/sda1 /mnt
sudo mount --bind /dev /mnt/dev &&
sudo mount --bind /dev/pts /mnt/dev/pts &&
sudo mount --bind /proc /mnt/proc &&
sudo mount --bind /sys /mnt/sys
sudo chroot /mnt
grub-install /dev/sda

or

grub-install --recheck /dev/sda
update-grub
exit &&
sudo umount /mnt/sys &&
sudo umount /mnt/proc &&
sudo umount /mnt/dev/pts &&
sudo umount /mnt/dev &&
sudo umount /mnt

References :
http://howtoubuntu.org/how-to-repair-restore-reinstall-grub-2-with-a-ubuntu-live-cd