Bug Report

Arduino 1.8.16
Linux Mint 19.2 (Ubuntu)

Arduino IDE serial monitor throws error "Error while setting serial port parameters: 250,000 N 8 1" when setting baud rate to 250000". It doesn't do this when selecting any other baud rate up to 2000000. With any rate other than 250000 the monitor comms work OK.

If another App is run first using the 250000 baud rate on the same port then closed and the Arduino IDE is started, the serial comms all works as expected at 250000 (error message still displays though).