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10372 discussions

Scanners
by Bev Nicolson 21 Mar '12

21 Mar '12

Have scanner won't scan. We've been there before but not with Simple Scan. It knows my AGFA Snap Scan is there but says it's unable to connect. It is plugged in! I've tried gksudo simplescan (was that right?) and nothing happened. Is it another case of having to install VueScan?* And if it is, can someone kindly take me through how to install it? Many thanks. Bev. (11.04.) *That's what I had to do with my last computer to get it to work.

2 9

Really strange automount symptoms
by Chris Green 20 Mar '12

20 Mar '12

I have been trying to diganose/fix this automount problem for quite a while. Automount of CDs, DVDs and USB sticks works fine on two of my xubuntu 11.10 systems but not on my desktop system. While trying to diagnose this I have found that it makes a difference using a remote display! If I run thunar on my system called 'test' where it works I see:- thunar-volman: Unsupported USB device type. thunar-volman: Unsupported USB device type. thunar-volman: Unknown block device type. ... and the USB stick automounts fine. If I do exactly the same except by a remote ssh connection to 'test' from my desktop system 'chris', I see:- thunar-volman: Unsupported USB device type. thunar-volman: Unsupported USB device type. thunar-volman: Unknown block device type. thunar-volman: Could not detect the volume corresponding to the device. ... and the USB stick *doesn't* automount. When I run thunar locally on my desktop system I see the same output (and failure to mount) that I see when running via ssh on 'test'. What on earth is going one? -- Chris Green

2 3

TeamCity & Jenkins behind Apache2 Proxy
by Paul Grenyer 19 Mar '12

19 Mar '12

Hi All (Please excuse the cross posting) I've Jenkins and TeamCity running on two separate VMs within my home network. I have another (physical) box running, among other things, Apache 2 (on Ubuntu server) and I have port 80 forwarded from my router to it. I've configured a number of virtual hosts on Apache, which work fine, and have proxies to two other web applications (subsonic & Nexus) running on Tomcat on the same box. What I want to do is add proxies for Jenkins and Tomcat. This is my configuration: <VirtualHost *:80> ... ProxyRequests Off ProxyPreserveHost On <Proxy *> Order allow,deny Allow from all </Proxy> ProxyPass /subsonic/ http://localhost:8080/subsonic/ ProxyPassReverse /subsonic/ http://localhost:8080/subsonic/ ProxyPass /nexus/ http://localhost:8080/nexus/ ProxyPassReverse /nexus/ http://localhost:8080/nexus/ ProxyPass /teamcity/ http://192.168.1.x1:8080/ ProxyPassReverse /teamcity/ http://192.168.1.x1:8080/ ProxyPass /jenkins/ http://192.168.1.15/ ProxyPassReverse /jenkins/ http://192.168.1.x2/ </VirtualHost> I think the Apache 2 configuration is fine and that the problems reside in the TeamCity and Jenkins configurations. I access them like this: http://<mydomain>/teamcity/ http://<mydomain>/jenkins/ In the case of TeamCity, it tries to redirect me to login.html, but looses the /teamcity/ part from the URL. In the case of Jenkins, the first obvious issue is that the CSS isn't referenced properly and some of the links don't work. I've done the obvious stuff like update the server URL for both TeamCity and Jenkins (just like I had to with Nexus). I've restarted everything, even the boxes/VMs. And Iv'e googled. I'm still stuck. Does anyone know what I'm doing wrong? -- Thanks Paul Paul Grenyer e: paul.grenyer(a)gmail.com b: paulgrenyer.blogspot.com t: pjgrenyer

3 4

Backup Trigger Method
by Paul Grenyer 18 Mar '12

18 Mar '12

Hi all I want to setup some regular backups on my Ubuntu server box. I have done this before, but it was a while ago and I don't remember how I did it. I seem to remember dropping some scripts into directories the contents of which are executed at a particular interval. However, i can't find these directories on the server i did it on and google isn't helping, What's the best way to schedule backups? -- Thanks Paul Paul Grenyer e: paul.grenyer(a)gmail.com b: paulgrenyer.blogspot.com t: pjgrenyer

3 3

How do USB drives get automounted? (mine don't and I'm trying to work out why)
by Chris Green 18 Mar '12

18 Mar '12

I have three xubuntu 11.10 systems running here, one is a 32-bit laptop and two are 64-bit desktop machines. USB drives plugged into the laptop and one of the dekstop machines get automounted correctly but on the other desktop machine although the USB drive is recognised (appears in dmesg as it should) it doesn't get automounted. So how can I diagnose what's wrong or missing on the desktop machine where the automounting doesn't work? I think it's *possible* that I have removed something necessary and/or misconfigured something as this machine is quite heavily customised. As I have a working machine and a non-working one I may be able to compare things between the two machines to see what is wrong but I need to know the sort of places I should be looking. What processes and packages are involved in automounting a USB drive? As I said it appears to be recognised correctly by the kernel, messages in dmesg and syslog are the same on both the system where it's not automounted and the system where it is. After the kernel has recognised the USB device as a mass storage device what then mounts it automatically and (if configured to do so, which it is) pops up thunar? Any/all help would be most welcome as this problem is getting really annoying! -- Chris Green

2 2

[ALUG Announce] 3rd Monday Monthly Ipswich Social Meeting : McGintys, Northgate Street
by samwise 17 Mar '12

17 Mar '12

ALUG Announce Please send announcements to Announce(a)lists.alug.org.uk Unsub, change settings via http://lists.alug.org.uk/mailman/listinfo/announce ----- The monthly "Third Monday" ALUG Ipswich Social Meeting is back this Monday, 19th March, at 20:00: P J McGinty & Sons 15 Northgate Street Ipswich Suffolk IP1 3BY Tel: 01473 251 515 Map/Directions URI: http://maps.google.co.uk/?q=IP1+3BY WWW: http://www.pjmcgintys.co.uk/ McGintys pub is in the centre of Ipswich. It's directly opposite the town's central library and has a reputation for good Irish beer. We're usually to be found in the lowest section of the bar, near the library entrance to the pub. All are welcome, novices and experienced users. Feel free to ask for further information on the Main ALUG mailing list. *** I'll be there to start with but due to a rather big family medical issue, I may not be able to stick around for more than an hour. Will have to see on Monday. *** Peter. ----- Send discussion replies to main(a)lists.alug.org.uk (Reply-To set) Unsub, change settings via http://lists.alug.org.uk/mailman/listinfo/announce

1 0

Determining "my" LAN IP
by Mark Rogers 16 Mar '12

16 Mar '12

What's the best way (programatically) to determine the local IP which would be used to make a connection to a specific destination? By way of example, the following works: $ tracepath -n 192.168.251.132 1: 192.168.251.140 3.816ms pmtu 1500 1: ... $ tracepath -n 10.0.0.1 1: 10.0.0.140 1.455ms pmtu 1500 1: ... In other words the PC I ran it on has several IP addresses (and several interfaces), but from the above I can determine that for destination 192.168.251.132 by source IP will be 192.168.251.140, but for destination 10.0.0.1 it will be 10.0.0.140. However this is quite slow and messy, and there is surely a better way! Mark Rogers -- Mark Rogers // More Solutions Ltd (Peterborough Office) // 0844 251 1450 Registered in England (0456 0902) 21 Drakes Mews, Milton Keynes, MK8 0ER

3 3

Any UDP comms experts here?
by Mark Rogers 16 Mar '12

16 Mar '12

I have a device I need to talk to via UDP from within PHP (although it feels like my problem here is a Linux one not a PHP one as everything is being done at the socket level anyway). I am sending a request to an Ethernet module in a PLC, and if I get the addressing wrong in my request then I get an error response back from the PLC as expected (by which I mean a 22 byte message sent via UDP containing the relevant error code) - I see this in my PHP code and in a Windows (Winsock-based) app I have that lets me send test queries and see the responses. However, when I get my addressing correct, whilst the Windows app gives me the response associated with the request I made, in my PHP/Linux code I just get no response (my code hangs up waiting). The PHP code I'm struggling with is: // Create a socket $socket = socket_create(AF_INET, SOCK_DGRAM, SOL_UDP); // Build the message $msg = hex2str('80 00 02 00 01 00 00 11 00 00 05 01'); // Send the message socket_sendto($socket, $msg, strlen($msg), 0, '192.168.251.132', '9600'); // Get the response - this line never returns socket_recvfrom($socket, &$buf, /*Max response length*/250, /*Flags*/0, &$ip, &$port); I would guess that the Ethernet module in the PLC either responds immediately with a response to tell me I have the address wrong, or else has to go off and collect some data before sending it back, although the time this takes is milliseconds. If I set Flags to MSG_DONTWAIT the code no longer hangs; it just returns no characters, even if I put a delay of a couple of seconds before the function call. I'm pretty sure that the key to the solution lies in getting the flags right but there I'm stumped due to lack of knowledge (and everywhere I can find sample code the above works fine). The list of possible flags is in the PHP docs[1] but I think a fuller list would be those listed in "man 2 recv" Any suggestions? [1]http://www.php.net/manual/en/function.socket-recvfrom.php -- Mark Rogers // More Solutions Ltd (Peterborough Office) // 0844 251 1450 Registered in England (0456 0902) 21 Drakes Mews, Milton Keynes, MK8 0ER

2 5

How to get rid of this duff directory?
by Chris Green 15 Mar '12

15 Mar '12

I think this may well be connected with my recent question about automounting. How do I get rid of this broken .gvfs directory:- -rw------- 1 chris chris 0 2012-01-03 10:28 .gtk-bookmarks -rw-rw-r-- 1 chris chris 82 2011-12-29 11:18 .gtkrc-2.0 d????????? ? ? ? ? ? .gvfs drwxr----- 2 chris chris 4096 2012-03-11 17:04 .hplip drwxrwxr-x 3 chris chris 4096 2012-02-15 20:20 .icedtea I can't even ls it directly:- chris$ ls -d .gvfs ls: cannot access .gvfs: Permission denied -- Chris Green

4 5

What do these "Kernel Errors" mean?
by Chris Green 11 Mar '12

11 Mar '12

In my daily logwatch E-Mail I have just noticed the following:- WARNING: Kernel Errors Present EXT2-fs (sdd): error: can't find an e ...: 1 Time(s) EXT3-fs (sdd): error: can't find ext3 ...: 1 Time(s) ... ... ... usb 2-1.1: device descriptor read/64, error -32 ...: 4 Time(s) This possibly explains why the USB flash drive that was /dev/sdd failed to automount. It can be mounted without problems manually using a straightforward mount command. Can anyone explain what I need to do to fix it? The flash drive has a FAT16 file system on it as is normal I think. -- Chris Green

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