No ':' in the url

Question

Starting fairly recently whenever I open the Minecraft launcher I get this error message

Invalid url: '/home/kailas/Downloads/Minecraft.jar' given, exiting
No ':' in the uri

What does this mean? I use Ubuntu 14.04.

Answer 1

It looks like your program expects something in the form of :

file:///home/kailas/Downloads/Minecraft.jar

For more information on url syntax, read this wikipedia article.