ltsp-build-client --ltsp-cluster produces a malfunctioning bootstrap.

When the bootstrap that ltsp-cluster clients will use is generated, and thinclients booting with that image, they will not finish booting, and do not connect to appserver that have been assigned to them. In the boot process show the following

./screen_session: 48: [: Illegal number:
./screen_session: 78: ./screen_session: /usr/share/ltsp/screen.d/: Permission denied

I found that the problem is in the file /usr/share/ltsp/screen_session that is generated within said bootstrap (in my case /opt/ltsp/amd64/usr/share/ltsp/screen_session). In particular the problematic line is this (line 54)

unset $ (env | egrep '. ^ (\ w +) = (*) $' | egrep -VW 'PWD | USER | PATH | HOME' | / usr / bin / cut-d = f1)

this line unset the SCREEN_NUM variable , and so when line 78 is executed

 "$ script_path" "$ args"

Happends the error, since only variable was script_path the path and not the script to launch.

The solution is change this line for this:

unset $ (env | egrep '. ^ (\ w +) = (*) $' | egrep -VW 'PWD | USER | PATH | HOME | SCREEN_NUM |' | / usr / bin / cut-d = f1)

Thus the variable is not removed SCREEN_NUM

I attached the modified file, with this bugfix.

Regards.