Not sure if the is closed. But I am new too. Mine is BBBA6A and I am using 
the latest image 18-06-2017 4.4
I ssh and when I run Linuxcnc I get the same error rtapi app not running 
and it fails. As this is prebuilt I assume SUID in not the cause
Error message is the same as this post. Any help would be appreciated

On Sunday, 19 March 2017 23:17:41 UTC-4, Brian Schousek wrote:
>
>
> I'm trying to get a basic Machinekit up and running on an older PC. I've 
> apparently successfully installed and started an RT-PREEMPT kernel (see ref 
> 1), properly installed the appropriate machinekit packages (see ref2), and 
> tried to start things up with various configurations. Ref 3 shows a 
> representative error (through iterations I determined that just trying to 
> run 'realtime' yields the same errors as starting the whole package, and 
> errors out much quicker.) My interpretation of ref 3 is that it is trying 
> to run rtapi_posix (not installed) instead of rt-preempt. As can be seen in 
> ref 4 there is an executable for rtapi_app_rt-preempt but no 
> rtapi_app_posix so it's no great surprise there is an error in ref 3.
>
> What simple thing am I missing here? I've been unsuccessful in finding a 
> solution in this forum and on the machinekit website. 
>
>
> *Ref 1*
> {
> brian@surely:/usr/libexec/linuxcnc⇒  uname -a
> Linux surely 4.1.19-rt22mah #1 SMP PREEMPT RT Tue Mar 15 09:12:20 CET 2016 
> i686 GNU/Linux
> }
>
> *Ref 2*
> {
> brian@surely:/usr/libexec/linuxcnc⇒  apt list --installed | grep machine
> machinekit/stable,now 0.1.1489960089-1mk.travis.master.git7df8d183~1jessie 
> i386 [installed,automatic]
> machinekit-dev/stable,now 
> 0.1.1489960089-1mk.travis.master.git7df8d183~1jessie i386 [installed]
> machinekit-rt-preempt/stable,now 
> 0.1.1489960089-1mk.travis.master.git7df8d183~1jessie i386 [installed]
> }
>
> *Ref 3*
> {brian@surely:~⇒  sudo realtime start                                     
>                                
> Warning - /usr/libexec/linuxcnc/rtapi_app_posix not setuid
> 'sudo make setuid' missing?
> /usr/bin/realtime: line 111: test: =: unary operator expected
> /usr/bin/realtime: line 174:  4065 Segmentation fault      ${rtapi_msgd} 
> --instance=$MK_INSTANCE $NAME_CMD --rtmsglevel=$DEBUG --usrmsglevel=$DEBUG 
> --halsize=$HAL_SIZE $MSGD_OPTS
> rtapi_msgd startup failed - aborting
> /usr/bin/realtime: line 192: /usr/libexec/linuxcnc/rtapi_app_posix: No 
> such file or directory
> rtapi_app startup failed - aborting
> halcmd: cant connect to rtapi_app: -1 (uri= 
> uuid=a42c8c6b-4025-4f83-ba28-dad21114744a): rtapi_rpc(): reply timeout
>
> halcmd: the rtapi:0 RT demon is not running - please investigate 
> /var/log/linuxcnc.log
> halcmd: the msgd:0 logger demon is not running - please investigate 
> /var/log/linuxcnc.log
> }
>
> *Ref 4*
> {
> brian@surely:~⇒  ls /usr/libexec/linuxcnc  -l                             
>                               
> total 200
> -rwxr-xr-x 1 root root  14888 Mar 19 17:52 flavor
> -rwxr-xr-x 1 root root   5960 Mar 19 17:52 inivar
> -rwxr-xr-x 1 root root  14268 Mar 19 17:52 pci_read
> -rwxr-xr-x 1 root root  14288 Mar 19 17:52 pci_write
> -rwsr-xr-x 1 root root 101368 Mar 19 17:52 rtapi_app_rt-preempt
> -rwxr-xr-x 1 root root  43960 Mar 19 17:52 rtapi_msgd
> }
>

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