After installing sublime text, we must be able to open text files with it. Right click on a text file and you must see the option "open with sublime text". In case you don't, click Open with other applications and you should see Sublime text option there. No luck yet, here are the troubleshooting steps.
# open the .desktop file for sublime
sudo sublime /usr/share/applications/sublime.desktop
# add the below lines to the file
[Desktop Entry]
Version=1.0
Name=Sublime Text 2
# Only KDE 4 seems to use GenericName, so we reuse the KDE strings.
# From Ubuntu's language-pack-kde-XX-base packages, version 9.04-20090413.
GenericName=Text Editor
Exec=sublime %f
Terminal=false
Icon=/opt/Sublime Text 2/Icon/48x48/sublime_text.png
Type=Application
Categories=TextEditor;IDE;Development
X-Ayatana-Desktop-Shortcuts=NewWindow
[NewWindow Shortcut Group]
Name=New Window
Exec=sublime -n
TargetEnvironment=Unity
This adds Open with Sublime text in right click context menu.