Help making munin work in ubuntu with lighttpd

I’m trying to install munin in my ubuntu VPS
I used apt install munin-node munin to install it.

But I can’t make the web interface work.
Since I already have pihole there I’m using lighttpd with this config (for the most part the default from the documentation)

<pre style="background-color:#ffffff;">
<span style="color:#323232;">server.modules += ( "mod_alias" )
</span><span style="color:#323232;">server.modules += ( "mod_fastcgi" )
</span><span style="color:#323232;">server.modules += ( "mod_rewrite" )
</span><span style="color:#323232;">
</span><span style="color:#323232;">$SERVER["socket"] == ":8467" {
</span><span style="color:#323232;">
</span><span style="color:#323232;">alias.url += ( "/munin-static" => "/etc/munin/static" )
</span><span style="color:#323232;">alias.url += ( "/munin"        => "/var/cache/munin/www/" )
</span><span style="color:#323232;">server.document-root = "/var/cache/munin/www/"
</span><span style="color:#323232;">
</span><span style="color:#323232;">fastcgi.server += ("/munin-cgi/munin-cgi-graph" =>
</span><span style="color:#323232;">                   (( "socket"      => "/var/run/lighttpd/munin-cgi-graph.sock",
</span><span style="color:#323232;">                      "bin-path"    => "/usr/lib/munin/cgi/munin-cgi-graph",
</span><span style="color:#323232;">                      "check-local" => "disable",
</span><span style="color:#323232;">                   )),
</span><span style="color:#323232;">                  "/munin-cgi/munin-cgi-html" =>
</span><span style="color:#323232;">                   (( "socket"      => "/var/run/lighttpd/munin-cgi-html.sock",
</span><span style="color:#323232;">                      "bin-path"    => "/usr/lib/munin/cgi/munin-cgi-html",
</span><span style="color:#323232;">                      "check-local" => "disable",
</span><span style="color:#323232;">                   ))
</span><span style="color:#323232;">                 )
</span><span style="color:#323232;">
</span><span style="color:#323232;">url.rewrite-repeat-if-not-file += (
</span><span style="color:#323232;">                   "/munin/(.*)" => "/munin-cgi/munin-cgi-html/$1",
</span><span style="color:#323232;">                   "/munin-cgi/munin-cgi-html$" => "/munin-cgi/munin-cgi-html/",
</span><span style="color:#323232;">                   )
</span><span style="color:#323232;">}
</span>

When the service is restarted it the log shows this error even when the files have 777 permissions

<pre style="background-color:#ffffff;">
<span style="color:#323232;">(gw_backend.c.1404) invalid "bin-path" => "/usr/lib/munin/cgi/munin-cgi-graph" (check that file exists, is regular file, and is executable by lighttpd)
</span><span style="color:#323232;">(gw_backend.c.1404) invalid "bin-path" => "/usr/lib/munin/cgi/munin-cgi-html" (check that file exists, is regular file, and is executable by lighttpd)
</span>

When I try to run a config with the command lighttpd -D -f /etc/munin/lighttpd.conf
The output is this

<pre style="background-color:#ffffff;">
<span style="color:#323232;">(gw_backend.c.324) child exited: 1 unix:/var/run/lighttpd/munin-cgi-html.sock-3
</span><span style="color:#323232;">(gw_backend.c.468) unlink /var/run/lighttpd/munin-cgi-html.sock-3 after connect failed: Connection refused
</span><span style="color:#323232;">(gw_backend.c.324) child exited: 1 unix:/var/run/lighttpd/munin-cgi-graph.sock-0
</span><span style="color:#323232;">(gw_backend.c.468) unlink /var/run/lighttpd/munin-cgi-graph.sock-0 after connect failed: Connection refused
</span>

Do you guys have any clue what might be happening?