To install Linumeric-LPT on your computer, you can use a slightly more modern solution and use Xubuntu 18.04.5. The installer is based on the distribution prepared by the user tuxcnc from the www.cnc.info.pl forum who prepared it and made available the installer of the Xubuntu system on 18.04.5 with the PREEMPT_RT real-time kernel, version 5.6.19. The system prepared by tuxcnc can be downloaded by clicking on xubuntu-18.04.5-tuxcnc.1-amd64.iso.
The above system is not able to run in Live mode with a real-time kernel. The real-time kernel does not boot until the system is installed on disk. There is also no Linumeric-LPT support installed yet.
To install Linumeric-LPT, download the LINUMERIC_LPT_V1_XUBUNTU1804.tar.gz package and place it in the user's directory. Then unpack the package to a directory with a name such as archive (note, do not use spaces in the name). After unpacking, the archive file can be deleted.
Then go to the directory in the directory and run the terminal
Enter in the terminal:
and hit Enter.
The installer will start.
Enter the password and hit enter. The installation will start, which will not be as long as if you were installing on debian whezy or on a raspberry, since neither the kernel nor linuxCNC are compiled in this case.
Upon completion, we will receive the message: Done
After installation, you can use LinuxCNC and Linumeric-LPT.
Still a little optimization. Because real-time processes use the processor cores in the order from the last one, if we have more than one core, it is worth excluding it from use for the system so that it remains completely available to the RT process. So we start the terminal and type the nproc command and hit enter. The number of processor cores will appear. We close the terminal and run the Grub-customizer program.
He will ask for a password, so type in and hit enter
Go to the general settings tab and enter which core to isolate. The isolcpus command is responsible for this. Note, the cores are numbered from 0, so if we have, for example, 4 cores, they have the numbers 0, 1, 2, 3 and then enter the number 3. If the processor has, for example, 4 cores and each core supports 2 threads, we have 8 cores and then we enter the last 2 numbers, i.e. 6.7.
Click the Save button to make the grub update. We close the program. Now it's worth restarting your computer.