The default baudrate on the latest github Cura (yesterday) was set to 250000, so initially starting Cura failed on the initial machine test.
It connects now when I change that as follows:
File -> Machine Settings -> Baudrate = 115200
Expert -> Run first run wizard
250000 baud is a problem on Linux. I added a patch to the latest git version of Cura which might help, but I have not had reports that it works.
You can install the 115200 baudrate firmware, this should fix the connecting problem. It installs as default firmware if you run on linux.
(And the patch should work. PySerial is at version 2.6, but your Python version is 2.7, as Cura needs python 2.7)
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