Cfrgtkky

I have Ubuntu 18.04 LTS installed.

I installed Arduino IDE v1.8.5 as a snap with

snap install arduino-mhall119

I have added my user to dial-out group and rebooted:

sudo usermod -a -G dialout $USER



$ groups 

username adm dialout cdrom sudo dip plugdev lpadmin sambashare

I connected my Arduino Nano to the laptop, it is detected on port /dev/ttyUSB0 (ch341-uart).

$ ls /dev/ttyUSB0 -al

crw-rw---- 1 root dialout 188, 0 авг 13 11:59 /dev/ttyUSB0

I tried to upload the simpliest Blink sketch and get the following errors in the terminal:

$ arduino-mhall119.arduino 





avrdude: ser_open(): can't open device "/dev/ttyUSB0": Permission denied  

Problem uploading to board.  See http://www.arduino.cc/en/Guide/Troubleshooting#upload for suggestions.**

Also I have installed arduino 1.8.5 with umake - it can access serial port in usual way.

Note: we already have similar question here, but the solution was to use package from umake, not fix for the Snap.

So my question is: How to make Arduino (Snap) access serial port /dev/ttyUSB0 (or /dev/ttyACM0)?

Update: connecting serial-port to the snap fails with the following message

$ snap connect arduino-mhall119:serial-port 

error: snap "core" has no "serial-port" interface slots

Current interfaces are:

$ snap interfaces | grep arduino

:home                            arduino-mhall119,gedit,organize-my-files,vlc

:network                         arduino-mhall119,gedit,organize-my-files,pulsemixer,vlc

:unity7                          arduino-mhall119,gedit,organize-my-files,vlc

:x11                             arduino-mhall119,organize-my-files,pulsemixer,vlc

-                                arduino-mhall119:serial-port

Changing permissions of serial port to 777 with sudo chmod 777 /dev/ttyUSB0 does not help.

The following do not work too (because of syntax errors):

$ sudo snap connect arduino-mhall119:arduino

error: snap "arduino-mhall119" has no plug named "arduino"



$ snap connect arduino-mhall119:/dev/ttyUSB0

error: snap "arduino-mhall119" has no plug named "/dev/ttyUSB0"



$ snap connect arduino-mhall119

error: cannot resolve connection, plug snap name is empty

Information about YAML-manifest:

$ ls -l /snap/arduino-mhall119/current/meta/snap.yaml

-rw-r--r-- 1 root root 353 июл 28 00:20 /snap/arduino-mhall119/current/meta/snap.yaml



$ cat /snap/arduino-mhall119/current/meta/snap.yaml |grep -A 12 slots



$ cat /snap/arduino-mhall119/current/meta/snap.yaml |grep -A 5 plug

    plugs:

    - x11

    - unity7

    - home

    - network

    - serial-port

Install the snap in classic mode to allow access to ports

$ snap install arduino-mhall119 --classic

It's that simple. You should now have access to your serial ports! Happy Hacking!

Note: info below are needed for old Arduino 1.6.10.

Some interesting links that helped find the answer

Auto connected serial port interface

Lundamar says:
Until the serial-port gadget/interface is improved to give access to all system serial devices you can get your snap working by simply installing it non-confined like so:

$ snap install tio --classic

It’s better than nothing but it surely would be best to run it confined with allowed access to serial tty devices.

Interfaces - serial-port

Interfaces reference:

serial-port

Can access serial ports. This is restricted because it provides privileged access to configure serial port hardware. Note that the slot is meant to be implemented by a gadget snap (this is not provided by the core snap).

Gadget providing serial-port slot