How to install minecraft mods for 1.7.9 on linux?

Nothing blows more then not only not being able to join lan games and online servers no matter wehat I try, this **** used to work on Ubuntu back in 2011 & 12 when the launcher was easy and there wasn't all the damn windows auto installers that are useless on Linux. My question is, "How the flying **** juice," do you add mods to Minecraft? And this is the year 2014, so please give me answers relivent to the new launcher that is more of a ***** then saint. I got severe anger issues and this **** is pissing me the **** off and at any moment I might **** this computer up with my AK… Like For real this **** is harder then it needs to be… So here is the deets… I'm using the Mineshafter 1.4.2 launcher, I tried MCpatcher to install the ******* and that just didn't do ****… I went into the.minectraft folder and found the minecraft folder and opened it and manually installed the mods the same way I did years ago. Didn't work, even installed Forge first… Then some dude on google or Youtube, I don't remember who nor do I care, but any how he stated that you go to the versions foldier and slect the Jar files there and add the mods to those then select the version as a new profile or whatever and I did that **** and it still don't work! So can someone please, tell me how to do this?
The year is 2014…
Minecraft 1.7.9 is where it's at…
And the Mineshafter 1.4.2 launcher is what I use…
And I have Ubuntu 14.04 LTS