This question already has an answer here:
Modern smartphones are no longer USB based mass storage, MTP is used instead. This is not good. I want to move music and folders to my phone just normal filetransfers deleting renaming copy folders etc.
In Ubuntu 12.10 I can not make file transfer to my phone because MTP is not supported, gMTP does not work, Airdroid works but is slow, and not user friendly. Ubuntu "sees" my phone but I can not do anything.
Ubuntu 13.04 I can copy to the phone one file at the time, not a folder, not huge amounts of data.
This is not good enough. Airdroid or Dropbox is usefull but to slow and not user friendly.