hai aggiunto il tuo utente al gruppo scanner?
https://wiki.archlinux.org/index.php/Sane
D [30/Mar/2012:18:44:06 +0200] cupsdReadClient: 15 GET /admin HTTP/1.1
D [30/Mar/2012:18:44:06 +0200] cupsdSetBusyState: newbusy="Active clients", busy="Not busy"
D [30/Mar/2012:18:44:06 +0200] cupsdAuthorize: Authorized as root using Basic
D [30/Mar/2012:18:44:06 +0200] [CGI] argv[0] = "/usr/lib/cups/cgi-bin/admin.cgi"
D [30/Mar/2012:18:44:06 +0200] [CGI] envp[0] = "CUPS_CACHEDIR=/var/cache/cups"
D [30/Mar/2012:18:44:06 +0200] [CGI] envp[1] = "CUPS_DATADIR=/usr/share/cups"
D [30/Mar/2012:18:44:06 +0200] [CGI] envp[2] = "CUPS_DOCROOT=/usr/share/cups/doc"
D [30/Mar/2012:18:44:06 +0200] [CGI] envp[3] = "CUPS_FONTPATH=/usr/share/cups/fonts"
D [30/Mar/2012:18:44:06 +0200] [CGI] envp[4] = "CUPS_REQUESTROOT=/var/spool/cups"
D [30/Mar/2012:18:44:06 +0200] [CGI] envp[5] = "CUPS_SERVERBIN=/usr/lib/cups"
D [30/Mar/2012:18:44:06 +0200] [CGI] envp[6] = "CUPS_SERVERROOT=/etc/cups"
D [30/Mar/2012:18:44:06 +0200] [CGI] envp[7] = "CUPS_STATEDIR=/var/run/cups"
D [30/Mar/2012:18:44:06 +0200] [CGI] envp[8] = "HOME=/var/spool/cups/tmp"
D [30/Mar/2012:18:44:06 +0200] [CGI] envp[9] = "PATH=/usr/lib/cups/filter:/usr/bin:/usr/sbin:/bin:/usr/bin"
D [30/Mar/2012:18:44:06 +0200] [CGI] envp[10] = "SERVER_ADMIN=root@Nosonja"
D [30/Mar/2012:18:44:06 +0200] [CGI] envp[11] = "SOFTWARE=CUPS/1.5.2"
D [30/Mar/2012:18:44:06 +0200] [CGI] envp[12] = "TMPDIR=/var/spool/cups/tmp"
D [30/Mar/2012:18:44:06 +0200] [CGI] envp[13] = "USER=root"
D [30/Mar/2012:18:44:06 +0200] [CGI] envp[14] = "CUPS_SERVER=/var/run/cups/cups.sock"
D [30/Mar/2012:18:44:06 +0200] [CGI] envp[15] = "CUPS_ENCRYPTION=IfRequested"
D [30/Mar/2012:18:44:06 +0200] [CGI] envp[16] = "IPP_PORT=631"
D [30/Mar/2012:18:44:06 +0200] [CGI] envp[17] = "AUTH_TYPE=Basic"
D [30/Mar/2012:18:44:06 +0200] [CGI] envp[18] = "LANG=it_IT.UTF8"
D [30/Mar/2012:18:44:06 +0200] [CGI] envp[19] = "REDIRECT_STATUS=1"
D [30/Mar/2012:18:44:06 +0200] [CGI] envp[20] = "GATEWAY_INTERFACE=CGI/1.1"
D [30/Mar/2012:18:44:06 +0200] [CGI] envp[21] = "SERVER_NAME=localhost"
D [30/Mar/2012:18:44:06 +0200] [CGI] envp[22] = "SERVER_PORT=631"
D [30/Mar/2012:18:44:06 +0200] [CGI] envp[23] = "REMOTE_ADDR=[v1.::1]"
D [30/Mar/2012:18:44:06 +0200] [CGI] envp[24] = "REMOTE_HOST=localhost"
D [30/Mar/2012:18:44:06 +0200] [CGI] envp[25] = "SCRIPT_NAME=/admin"
D [30/Mar/2012:18:44:06 +0200] [CGI] envp[26] = "SCRIPT_FILENAME=/usr/share/cups/doc/admin"
D [30/Mar/2012:18:44:06 +0200] [CGI] envp[27] = "REMOTE_USER=root"
D [30/Mar/2012:18:44:06 +0200] [CGI] envp[28] = "SERVER_PROTOCOL=HTTP/1.1"
D [30/Mar/2012:18:44:06 +0200] [CGI] envp[29] = "HTTP_COOKIE=org.cups.sid=706fa59aff06993723ef5a27e8500f13"
D [30/Mar/2012:18:44:06 +0200] [CGI] envp[30] = "HTTP_USER_AGENT=Mozilla/5.0 (X11; Linux i686) AppleWebKit/536.3 (KHTML, like Gecko) Chrome/19.0.1071.0 Safari/536.3"
D [30/Mar/2012:18:44:06 +0200] [CGI] envp[31] = "HTTP_REFERER=http://localhost:631/"
D [30/Mar/2012:18:44:06 +0200] [CGI] envp[32] = "REQUEST_METHOD=GET"
D [30/Mar/2012:18:44:06 +0200] [CGI] envp[33] = "QUERY_STRING="
D [30/Mar/2012:18:44:06 +0200] [CGI] Started /usr/lib/cups/cgi-bin/admin.cgi (PID 2003)
I [30/Mar/2012:18:44:06 +0200] Started "/usr/lib/cups/cgi-bin/admin.cgi" (pid=2003)
D [30/Mar/2012:18:44:06 +0200] cupsdSendCommand: 15 file=21
D [30/Mar/2012:18:44:06 +0200] [CGI] admin.cgi started...
D [30/Mar/2012:18:44:06 +0200] cupsdAcceptClient: 22 from localhost (Domain)
D [30/Mar/2012:18:44:06 +0200] [CGI] http=0xb848b850
D [30/Mar/2012:18:44:06 +0200] [CGI] org.cups.sid cookie is "706fa59aff06993723ef5a27e8500f13"
D [30/Mar/2012:18:44:06 +0200] [CGI] No form data, showing main menu...
D [30/Mar/2012:18:44:06 +0200] [CGI] /usr/share/cups/drivers/pscript5.dll: File o directory non esistente
D [30/Mar/2012:18:44:06 +0200] cupsdReadClient: 22 POST / HTTP/1.1
D [30/Mar/2012:18:44:06 +0200] cupsdSetBusyState: newbusy="Active clients", busy="Active clients"
D [30/Mar/2012:18:44:06 +0200] cupsdAuthorize: No authentication data provided.
D [30/Mar/2012:18:44:06 +0200] cupsdReadClient: 22 1.1 Get-Subscriptions 1
D [30/Mar/2012:18:44:06 +0200] Get-Subscriptions ipp://localhost/
D [30/Mar/2012:18:44:06 +0200] Get-Subscriptions client-error-not-found: Nessuna sottoscrizione trovata.
D [30/Mar/2012:18:44:06 +0200] Returning IPP client-error-not-found for Get-Subscriptions (ipp://localhost/) from localhost
D [30/Mar/2012:18:44:06 +0200] cupsdSetBusyState: newbusy="Active clients", busy="Active clients"
D [30/Mar/2012:18:44:06 +0200] Script header: Content-Type: text/html;charset=utf-8
D [30/Mar/2012:18:44:06 +0200] Script header:
D [30/Mar/2012:18:44:06 +0200] PID 2003 (/usr/lib/cups/cgi-bin/admin.cgi) exited with no errors.
D [30/Mar/2012:18:44:06 +0200] cupsdReadClient: 22 WAITING Closing on EOF
D [30/Mar/2012:18:44:06 +0200] cupsdCloseClient: 22
D [30/Mar/2012:18:44:06 +0200] cupsdSetBusyState: newbusy="Active clients", busy="Active clients"
D [30/Mar/2012:18:44:06 +0200] cupsdSetBusyState: newbusy="Not busy", busy="Active clients"
D [30/Mar/2012:18:44:08 +0200] cupsdReadClient: 15 GET /admin/log/error_log? HTTP/1.1
D [30/Mar/2012:18:44:08 +0200] cupsdSetBusyState: newbusy="Active clients", busy="Not busy"
D [30/Mar/2012:18:44:08 +0200] cupsdAuthorize: Authorized as root using BasicVisitano il forum: Nessuno e 1 ospite