A few details about the error: when running "bash -x /usr/bin/thunderbird -g",
the command trace ends as follows: ----- + output_info 'Starting Thunderbird with GDB ...' + echo 'INFO -> Starting Thunderbird with GDB ...' INFO -> Starting Thunderbird with GDB ... + output_info 'LANG= /usr/bin/gdb -ex handle SIG38 nostop -ex handle SIGPIPE nostop -ex run /usr/lib/thunderbird/thunderbird ' + echo 'INFO -> LANG= /usr/bin/gdb -ex handle SIG38 nostop -ex handle SIGPIPE nostop -ex run /usr/lib/thunderbird/thunderbird ' INFO -> LANG= /usr/bin/gdb -ex handle SIG38 nostop -ex handle SIGPIPE nostop -ex run /usr/lib/thunderbird/thunderbird + LANG= + exec '/usr/bin/gdb -ex handle SIG38 nostop -ex handle SIGPIPE nostop -ex run /usr/lib/thunderbird/thunderbird ' /usr/bin/thunderbird: line 249: /usr/bin/gdb -ex handle SIG38 nostop -ex handle SIGPIPE nostop -ex run /usr/lib/thunderbird/thunderbird : No such file or directory ----- It seems that the whole command line is interpreted as the filename to load. I did not recorded the shell exit status, but I believe that I saw 127, the usual code for "command not found". I also think that I experimented some problems with the "-ex" options when I tried to split this long exec argument into filename and arguments. Hence the proposed patch replaces this complex command line with a simple one and a temporary file containing the commands for Gdb. Note: the crash mentioned in the initial report is not the problem, only the motivation to run Thunderbird under Gdb. Regards.
