help needed installing linuxcnc as a simulator on my debian buster laptop

Error in startup script: bad pad value "3m": must be positive screen distance while executing "pack $w.msg -in $w.top -side right -expand 1 -fill both -padx 3m -pady 3m" (procedure "tk_dialog" line 65) invoked from within "tk_dialog .d [msgcat::mc "Copy Configuration?"] [msgcat::mc "Would you like to copy the %s configuration to your home directory so you can customize i..." (procedure "prompt_copy" line 3) invoked from within "prompt_copy $::inifile" invoked from within "if [ok_to_copy_config $::inifile] { set copied_inifile [prompt_copy $::inifile] if {$copied_inifile == ""} { c..." ("while" body line 6) invoked from within "while {1} { focus $::tree vwait ::choice if { $::choice == "OK" } { if [ok_to_copy_config $::inifile] { set copied_in..." (file "/usr/lib/tcltk/linuxcnc/bin/pickconfig.tcl" line 875)