Question [Q] Insufficient Storage - LG Optimus F6 [ROOTED]

I have seen this error mentioned all over the web but not a single solitary method has fixed it for me. I have tried every single method I've found, but cannot figure out the solution. I have 0.9GB left on the internal card, but can't install a single thing. Please help before I throw this thing out the window. :/ Thanks in advance.