nRF Connect Linux

Cannot connect to nRF52840DK board using nRF Connect Bluetooth Low Energy app on Linux (Ubuntu 18.04 LTS).  When I choose "Select Device" and choose my board, I get:

"Validating connectivity Firmware..."  followed by "Error while setting up device xxxxx.  Permission denied, cannot open /dev/ttyACM0"

Port ttyACM0 does exist, and most strangely, if I run the Programmer app under nRF Connect, it works fine.  It can connect to the board and perform all operations.  The same board run under nRF Connect / Bluetooth Low Energy on a Windows 10 PC works fine.

I did recently update both nRF Connect and BLE on the Linux laptop to v3.2.0 and 2.3.1 respectively.  The Windows PC is running nRF Connect v3.0.0 and BLE v2.3.0.  I am afraid to upgrade either until I understand what is happening with the Linux installation, as it used to work.

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