If the Linux system on the host PC fails to boot after installing the TRACE32 USB driver file 10-lauterbach.rules, the problem may be caused by incorrect line endings in the rules file. In particular, the presence of carriage return (CR) characters (^M) can cause the udev rules to be interpreted incorrectly.

How to check for CR characters

Run the following command:

cat -et /etc/udev/rules.d/10-lauterbach.rules

Check whether ^M characters are displayed at the end of the lines.

In some cases, /dev/lauterbach/trace32/ may contain symbolic links to unrelated system devices, such as audio, disk, or DVD devices. This can also indicate that the 10-lauterbach.rules file is being misinterpreted because of incorrect line endings.

How to fix the issue

1) Install the tofrodos package if it is not already installed:

sudo apt-get install tofrodos

2) Change to the directory containing the rules file:

cd /etc/udev/rules.d/

3) Convert the file to Unix (LF-only) line endings:

sudo fromdos -d 10-lauterbach.rules

This removes the CR characters from the file.

Afterwards, reboot the PC.