Setting other than Ubuntu as your primary boot option

Open Terminal:
Applications → Accessories → Terminal
Type:
sudo nautilus
enter your password
Nautilus browser is opened….
Go to File System → boot → grub → menu.lst
This file will be opened with gedit.
You will see something like the picture below.

To change the default operating system, scroll almost towards the end until you see something like the picture below. (The menu of [...]

Compress & Extract Files

PeaZip & 7-Zip…Both are open source file and archive manager. Both are cross platform, available as portable and can be used to compress or extract files of various types.
PeaZip
1. a) Packing : 7Z, ARC, BZ2, GZ, PAQ/LPAQ, PEA, QUAD/BALZ, TAR, UPX, ZIP;
b) Unpacking only: ACE, ARJ, CAB, DMG, ISO, LHA, RAR, UDF and many [...]