Ok a few things to note:
1. On linux the electrum wallet folder begins with a period that is it is .electrum in your home directory. So make sure you put it in the correct folder.
2. To answer your question about the menu, just follow the prompts to create a new dummy wallet until you get to the display with the menu. Alternatively use the command line switch:
electrum -w /path/to/wallet.dat
But try 1 first.
1. I know it, i can see .electrum folder pressing CTRL+H, but after i copied electrum.dat file in it Electrum doesn't start, as another user here said some posts before. This is the error i get when i run electrum command:
Traceback (most recent call last):
File "/usr/local/bin/electrum", line 165, in <module>
gui.main(url)
File "/usr/local/lib/python2.7/dist-packages/electrum_gui/qt/__init__.py", line 92, in main
wallet = Wallet(storage)
File "/usr/local/lib/python2.7/dist-packages/electrum/wallet_factory.py", line 11, in __new__
return Wallet(config)
File "/usr/local/lib/python2.7/dist-packages/electrum/wallet.py", line 173, in __init__
self.fee = int(storage.get('fee_per_kb',20000))
TypeError: int() argument must be a string or a number, not 'NoneType'
2. Done and when i open electrum.dat with Open using the menu nothing happens, as i said before.
In addition if i use the command line (electrum -w /home/my_user/Desktop/electrum.dat) i get the same error posted above.