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Try loading this dependencies and then install Linuxcnc (these dependevies are for the so called run in place RIP Linuxcnc installation, its a compiled installation) but it might help you with your deb method installation (in my case I refer rip). At the command prompt issue the following command:

Sudo apt install –y debhelper-compat dh-python libudev-dev docbook-xsl asciidoc imagemagick asciidoc-dblatex autoconf automake bwidget gettext intltool libboost-python-dev libepoxy-dev libgl-dev libgl1-mesa-dev libglu1-mesa-dev libgtk2.0-dev libgtk-3-dev libmodbus-dev libgpiod-dev libeditreadline-dev libusb-1.0-0-dev libxmu-dev po4a psmisc python3-dev python3-tk python3-xlib tcl8.6-dev tk8.6-dev xvfb yapps2 dblatex dvipng fonts-dejavu graphviz groff inkscape python3-lxml source-highlight texlive-extra-utils texlive-font-utils texlive-fonts-recommended texlive-lang-cyrillic texlive-lang-european texlive-lang-french texlive-lang-german texlive-lang-polish texlive-lang-spanish texlive-latex-recommended w3c-linkchecker xsltproc texlive-xetex

 

Im hooking up a spindle encoder on my lathe to a el5151. The abz inputs goes to the el5151 but in halshow i see how it every turn resets the encoder counts and position. Im guessing this would create problems when using sync motion? It also doesnt have a velocity pin so is it okay to use the software encoder counter to get the velocity. When i do this i get a very noisy signal where it goes to 20 the 500 then 1000 then 200 etc. Just all over the place. Is it bad too use a lowpass filter to smooth it?