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<h1>HP Linux Imaging and Printing (HPLIP)</h1>
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<a href="../index.html">Home</a> > <a href="index.html">Troubleshooting</a> > General/Other
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<div class="document" id="general-other-troubleshooting">
<h1 class="title">General/Other Troubleshooting</h1>
<p><strong>Issue 1: I am seeing messages like "Unable to find GUI for username..." and "No GUI available" in the system log.</strong></p>
<p>Solution:</p>
<p>These are normal and should not cause any concerns.</p>
<p><strong>Issue 2: How do I check the syslog for HPLIP system errors?</strong></p>
<p>Solution:</p>
<p>With superuser (su/sudo) privileges, use the following command to view the syslog. Look for any errors during the time of the failure.</p>
<pre class="literal-block">
# tail -f /var/log/messages
</pre>
<p><strong>Issue 3: How to debug HPLIP.</strong></p>
<p>Solution:</p>
<p>Debugging HPLIP is a several step process. Use su/sudo as applicable for your configuration and step.</p>
<p>The HPSSD process provides various services to HPLIP client applications. Maintains persistant device status. Putting hpssd in debug mode will assist in troubleshooting connection problems.</p>
<p>This will restart HPLIP and CUPS:</p>
<pre class="literal-block">
# /etc/init.d/hplip restart
</pre>
<pre class="literal-block">
# /etc/init.d/cups restart
</pre>
<p>for Ubuntu</p>
<pre class="literal-block">
$ /etc/init.d/cupsys restart
</pre>
<p>Go to the hplip working directory:</p>
<pre class="literal-block">
cd /usr/share/hplip
</pre>
<p>Find the hpssd.py process number:</p>
<pre class="literal-block">
# ps ax | grep hp
</pre>
<p>Find the line that looks like:</p>
<pre class="literal-block">
4193 ? S 0:00 python ./hpssd.py
</pre>
<p>Kill the hpssd.py process:</p>
<pre class="literal-block">
# kill 4193
</pre>
<p>for Ubuntu</p>
<pre class="literal-block">
$ sudo kill 4193
</pre>
<p>Start the hpssd.py process in debug mode:</p>
<pre class="literal-block">
# python ./hpssd.py -g
</pre>
<p>You should see something like this:</p>
<pre class="literal-block">
hpssd [DEBUG]: port=36181
hpssd Listening on localhost:36181
hpssd [DEBUG]: Starting async loop...
</pre>
<p>Then open a new terminal/console window: (Shift-Control-T if you are using Terminal)</p>
<p>Run the hp-toolbox in debug mode:</p>
<pre class="literal-block">
# hp-toolbox -g
</pre>
<p>Attempt to do the function you are having issues with, when the error occurs, note the information displayed for both the hp-toolbox and for hpssd.</p>
<p><strong>Issue 4: When I go to login to the CUPS web interface (http://localhost:631) it asks for my root password--and my root password doesn't give me access.</strong></p>
<p>Solution:</p>
<p>First verify with your distribution the proper way in each to install a printer for your system.</p>
<p>To enable the CUPS web interface follow these directions.</p>
<p>Edit the cupsd.conf file.</p>
<pre class="literal-block">
# gedit /etc/cups/cupsd.conf
</pre>
<p>Find this section:</p>
<pre class="literal-block">
# Restrict access to the admin pages...
<Location /admin>
#Order allow,deny
#Allow localhost
</Location>
</pre>
<p>Change it to:</p>
<pre class="literal-block">
# Restrict access to the admin pages...
<Location /admin>
Order allow,deny
Allow localhost
</Location>
</pre>
<p>Save/Exit, restart CUPS:</p>
<pre class="literal-block">
# /etc/init.d/cups restart
</pre>
<p>for Ubuntu</p>
<pre class="literal-block">
$ /etc/init.d/cupsys restart
</pre>
<p>Open your web browser, go to <a class="reference" href="http://localhost:631">http://localhost:631</a>. Complete the administrative tasks you need to complete.</p>
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<small>Last update: Thu Mar 16 17:21:05 2006</small>
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