@hummlbach I took the suggestion with file system remount, worked very fine and now I am able to do what I wanted when I bought Nexus 5 and installed UbuntuTouch - connect my phone with anything including via serial port !!!
Thank you very much, I already love everything here!

@hummlbach thanks for the suggestion.
Installing in home is not a bad idea, but sonce im not an expert, do u know how to install in home ensuring that the serial will still be importable?

hello, everybody! I am trying to install the pyserial package to my phone Nexus 5 via downloaded tar.gz archive, but the installation fails. can you please check the commands and suggest whats wrong? thanks in advance!

1. tar -xzf pyserial-3.4.tar.gz -> OK
2. cd /pyserial-3.4
3. sudo python3.5 setup.py install -> ends with «error: could not create '/usr/local/lib/python3.5/dist-packages/serial': Read-only file system»
   I tried changing the permission for this folder with «sudo chmod -R g+w /usr...dist-packages/» but that was also not successful. I woder do I have rights to access there at all?
   Please help me, I want to install new packages and acces other devices over serial. Thanks in adance!