https://bugs.winehq.org/show_bug.cgi?id=49752 --- Comment #1 from amad4wine2020(a)gmail.com --- On Windows 10 system I get 'Device not responding' (when nothing is actually connected to the serial port). On WINE (Ubuntu 20.04) I get 'Selected serial port not exist'. Tested under VirtualBox with virtual COM port. ttyS1 - VirtualBox serial port (Port Mode: Disconnected) The permissions seems correct to me. My user is added to the corresponding group. auser(a)auser-VirtualBox:~$ ls -la /dev/ttyS1 crw-rw---- 1 root dialout 4, 65 Sep 4 02:46 /dev/ttyS1 auser(a)auser-VirtualBox:~$ cat /etc/group | grep dial dialout:x:20:auser -- Do not reply to this email, post in Bugzilla using the above URL to reply. You are receiving this mail because: You are watching all bug changes.