[sane-devel] Problem with HP ScanJet 4p and SCSI

[David Brant]

Hi Dieter,

Yes, there is a group called users in /etc/group and i placed myself an
the other users as you specified.

users:x:100:david,celeste,rochelle

It now works successfully after booting for each individual!

Excellent, well done my friend. You have solved the problem, XSane now
works perfectly. I will keep your recommendations and the undev-rules
safe for future reference. I (and my fellow users) very much appreciate
your kind help with this.

Best regards from London   :-)))

Dave

On Wed, 2009-06-10 at 23:25 +0200, Dr. Ing. Dieter Jurzitza wrote: 
> Hi David,
> ok. It becomes clear now. Our udev-rule is in action (because the permissions 
> match the rules I defined). So far, so good.
> However, ubuntu does several things different to other distributions. A 
> regular user (like your "david" or mine "fred") has permissions like
> 
> owner: username
> group: users
> 
> in openSUSE and Debian and many others I know. However, "david" on ubuntu is 
> different in this regard and this is what causes the problems.
> 
> owner: david
> group: david
> 
> We have 2 options now. One would be to  open the device for everybody what I 
> would dislike. The other one is to make all users that should be allowed to 
> access the scanner members of the group "users" if that group exists. As I do 
> not know about the ubuntu configuration options, I can tell you the "hard" 
> way. Look into /etc/group. It should look similar to:
> 
> audio:x:17:fred,hoss
> avahi:!:106:
> beagleindex:!:108:
> bin:x:1:daemon
> cdrom:x:20:
> console:x:21:
> daemon:x:2:
> 
> Please check if there is an entry "users" like (the number might be 
> different):
> users:x:100
> 
> There you should add each user that should get access to your scanner. 
> 
> users:x:100:david,carl,george,shirley
> 
> If there is no group "users" present, simply add one. The number needs to be 
> one that does not exist in the list of groups in /etc/group
> 
> Alternatively you could create a group "scanner", too by adding it to the list 
> (similar format like the other entries). Then you have to add all users that 
> should be allowed to access the scanner like before you did to the group 
> users. _If_ you plan to go that path, you'll have to modify 
> /etc/udev/rules.d/55-scanner.rules, too. There you'd have to replace each 
> entry pointing to "users" by "scanner". I attached a corresponding readily 
> modified file to this email, it's up to your choice!
> 
> Let me know if something is unclear and be careful when editing /etc/group, 
> watch thoroughly that you place each comma and each : the way it is set in the 
> other entries in this file before saving. If unsure, write an email, It's 
> nothing magic about, but I understand very well that it is not that easy to 
> understand from the very begin.
> 
> After a reboot things should work, please report your success, we'll get this 
> done, soon!
> 
> Take care, greetings from Germany
> 
> 
> 
> 
> 
> Dieter
> 
> 
> 
> Am Mittwoch 10 Juni 2009 22:19:45 schrieben Sie:
> > Hi Dieter
> >
> > No need to apologise, your English is perfectly clear to me. The problem
> > is me and my limited understanding of linux!
> >
> > Here is my log.
> >
> > david at david-desktop:/etc/udev/rules.d$ dir
> ******
> 
>