title: rauc fails to mount .raucb files
body: <p>When I try to install a rauc package I get the following:</p>
  
  <blockquote>
    <p>root@phyboard-regor-am335x-1:/tmp# rauc install
    phytec-qt5demo-bundle-phyboard-regor-am335x-1-20200506102456.raucb 
    rauc-Message: installing
    /tmp/phytec-qt5demo-bundle-phyboard-regor-am335x-1-20200506102456.raucb:
    installing</p>
    
    <p>rauc-Message: installing
    /tmp/phytec-qt5demo-bundle-phyboard-regor-am335x-1-20200506102456.raucb:
    0% Installing</p>
    
    <p>rauc-Message: installing
    /tmp/phytec-qt5demo-bundle-phyboard-regor-am335x-1-20200506102456.raucb:
    0% Determining slot states</p>
    
    <p>rauc-Message: installing
    /tmp/phytec-qt5demo-bundle-phyboard-regor-am335x-1-20200506102456.raucb:
    20% Determining slot states done.</p>
    
    <p>rauc-Message: installing
    /tmp/phytec-qt5demo-bundle-phyboard-regor-am335x-1-20200506102456.raucb:
    20% Checking bundle</p>
    
    <p>rauc-Message: installing
    /tmp/phytec-qt5demo-bundle-phyboard-regor-am335x-1-20200506102456.raucb:
    20% Verifying signature</p>
    
    <p>rauc-Message: installing
    /tmp/phytec-qt5demo-bundle-phyboard-regor-am335x-1-20200506102456.raucb:
    40% Verifying signature done.</p>
    
    <p>rauc-Message: installing
    /tmp/phytec-qt5demo-bundle-phyboard-regor-am335x-1-20200506102456.raucb:
    40% Checking bundle done.</p>
    
    <p>rauc-Message: installing
    /tmp/phytec-qt5demo-bundle-phyboard-regor-am335x-1-20200506102456.raucb:
    100% Installing failed.</p>
    
    <p>rauc-Message: installing
    /tmp/phytec-qt5demo-bundle-phyboard-regor-am335x-1-20200506102456.raucb:
    LastError: Failed mounting bundle: failed to run mount: Child process
    exited with code 32</p>
    
    <p>Installing
    <code>/tmp/phytec-qt5demo-bundle-phyboard-regor-am335x-1-20200506102456.raucb</code>
    failed</p>
  </blockquote>
  
  <p>When I checked, I found that <code>squashfs</code> is not recognised by linux!!! What should I do to make <code>squashfs</code> be recognised?</p>