[sane-devel] SANE scanimage unable to connect to third party (backend) driver: brscan3

[Don Pitcher]

Thank you Ralf!!! Your recommendation fixed the problem.

I have added your and Andy's input to the Linux Mint tutorial thread for others to utilize.

https://forums.linuxmint.com/viewtopic.php?p=2632549#p2632549

Don Pitcher

On Wednesday, May 21st, 2025 at 12:28 PM, Ralph Little <skelband at gmail.com> wrote:

> Hi Don,
> Someone here very recently had exactly the same problem with the brother3 backend driver from Brother.
> Basically, their backend is very good, but things have moved on in the Linux world since it was built by them which has introduced some incompatibilities.
>
> There are a number of issues:
>
> 1) Linux Mint (and Ubuntu upon which it is based) puts its platform-specific shared objects in a different place. So the installed shared objects cannot be found. The package puts them in /usr/lib64 whereas Ubuntu/Mint expects them in /usr/lib/x86_64-linux-gnu. You can add symbolic links in /usr/lib/x86_64-linux-gnu to the files installed into /usr/lib64. One way is:
>
> sudo ln -s /usr/lib64/sane /usr/lib/x86_64-linux-gnu/sane
>
> 2) libusb has changed. The package needs an old version, which is still available in the repo. Try this:
>
> sudo apt install libusb-0.1-4
>
> OK, so now you should be able to see a device from scanimage -L. The device class is called "brother3" not "brscan3" BTW.
>
> I just worked through this sequence on my fresh install and it seems to work for me.
>
> Let us know how you get on.
>
> Cheers,
> Ralph
>
> On Wed, May 21, 2025 at 8:29 AM Don Pitcher via sane-devel <sane-devel at alioth-lists.debian.net> wrote:
>
>> Hello SANE-dev ,
>>
>> I am troubleshooting a problem with SANE scanimage unable connect to a third party driver (backend). I have exhausted all resources that I know of to solve this problem. Could you take a moment to review my post on the Linux Mint forum to help guide me to a helpful resource?
>>
>> $ sudo scanimage -d brscan3 -T
>> Output format is not set, using pnm as a default.
>> scanimage: open of device brscan3 failed: Invalid argument
>>
>> https://forums.linuxmint.com/viewtopic.php?p=2632488#p2632488
>>
>> Thank you,
>>
>> Don, aka: sk8board
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