In the documentation it is always suggested to run the Arduino IDE within "sudo" to not worry about permission problems (eg. sudo ./arduino)
I wondered if I could manage to run it as a plain user, like it works for the standard Arduino IDE. Following the guide of Arduino for Fedora Arduino Playground - Fedora you are told to make the user account part of the groups uucp, lock and dialout. For Debian/Ubuntu it is quite the same, only that there the membership of dialout is enough.
The attempt of starting ./arduino ended up in:
Native lib Version = RXTX-2.1-7
Java lib Version = RXTX-2.1-7
check_group_uucp(): error testing lock file creation Error details:Keine Berechtigungcheck_lock_status: No permission to create lock file.
please see: How can I use Lock Files with rxtx? in INSTALL
Considering the Arduino guide I was able to find out that the rxtx serial port library is creating the lock files at the wrong place (under /var/lock and not /var/lock/lockdev). Newer versions of this library, as on my system (2.2 - which is also used by the standard Arduino IDE) are fixed to use the correct path.
So I wondered about updating the library on Intel's Arduino IDE (release arduino-1.5.3-Intel.1.0.4). The first approach, the substitution of the JAR in lib/, failed (RXTXcomm.jar). The error messages disappeared, but the serial ports were not recognized.
The attempt of replacing the shared objects worked:
After launch there will be printed some "RXTX Version mismatch" warning, which seemed to not cause any harm.
I hope that this is enough to fix this permission issue for the next Intel Arduino IDE on Linux release, to allow it to be run also as non-root.