I can installed and run 

sudo apt-get install machinekit-posix
not a problem.

sudo apt-get install machinekit-rt-preempt
still a problem.

How do I fix it?
Thanks,
Tac.

 
MACHINEKIT - 0.1
Machine configuration directory is '/home/pi/machinekit/configs/sim.tklinuxcnc'
Machine configuration file is 'servo_sim.ini'
Starting Machinekit...
rtapi_msgd command:  /usr/libexec/linuxcnc/rtapi_msgd --instance=0 
--rtmsglevel=1 --usrmsglevel=1 --halsize=524288
rtapi_app command:  /usr/libexec/linuxcnc/rtapi_app_rt-preempt --instance=0
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
E: 18-09-17 15:17:07 dangling 'DEALER' socket created at 
hal/utils/halcmd_rtapiapp.cc:281
io started
halcmd: cant connect to rtapi_app: -1 (uri= 
uuid=a42c8c6b-4025-4f83-ba28-dad21114744a): rtapi_rpc(): reply timeout


On Friday, September 14, 2018 at 7:41:29 AM UTC-7, Tac Huynh wrote:
>
> Please help:
> How do I fix this installation error?
> Thanks,
> Tac.
>
> I tried to install Machinekit on Raspberry Pi 3, Raspian Stretch, got 
> following errors:
>
> sudo apt-get install machinekit-rt-preempt
>
> ....
> Setting up xdot (0.7-2) ...
> Setting up machinekit-rt-preempt (0.1.1536747208.git041712d-1~stretch) ...
> ln: failed to create symbolic link 
> '/usr/lib/linuxcnc/rt-preempt/pru_generic.bin': No such file or directory
> ln: failed to create symbolic link 
> '/usr/lib/linuxcnc/rt-preempt/pru_generic.dbg': No such file or directory
> ln: failed to create symbolic link 
> '/usr/lib/linuxcnc/rt-preempt/pru_decamux.bin': No such file or directory
> ln: failed to create symbolic link 
> '/usr/lib/linuxcnc/rt-preempt/pru_decamux.dbg': No such file or directory
> dpkg: error processing package machinekit-rt-preempt (--configure):
>  subprocess installed post-installation script returned error exit status 1
> dpkg: dependency problems prevent configuration of machinekit:
>  machinekit depends on machinekit-rt-threads; however:
>   Package machinekit-rt-threads is not installed.
>   Package machinekit-rt-preempt which provides machinekit-rt-threads is not 
> configured yet.
>
> dpkg: error processing package machinekit (--configure):
>  dependency problems - leaving unconfigured
> Processing triggers for libc-bin (2.24-11+deb9u3) ...
> Processing triggers for systemd (232-25+deb9u2) ...
> Errors were encountered while processing:
>  machinekit-rt-preempt
>  machinekit
> E: Sub-process /usr/bin/dpkg returned an error code (1)
>
>

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https://github.com/machinekit
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