#775 Linux: images not visible on canvas

[Maarten Boekhold]

'm trying to get NAPS2 working on Linux (Ubuntu 20.04) with my Epson L6190 AIO printer/scanner. After some trial and error, I've been able to compile NAPS2 on Linux itself with Mono.

After fixing #773 and #774, NAPS2 more or less works for me, except that I can't see the actual scanning results. The Page is there, as you can see from the attached screenshot. When the mouse cursor is over the location where the page is, the cursor changes to a hand, and the right-click brings up the "page context menu", but it's not actually visible.

Same for the Profile window, where you can see the created profiles, but the icon isn't actually visible (other attached screenshot). In this case, I have no idea what causes this issue.

I'm using Ubunto Mate Edition 20.04 with the latest version of Mono, installed from mono-project.com. I also installed the dotNET Core SDK.

Note that this is all with versions of NAPS2.Core.dll and NAPS2.Standalone.exe that I recompiled on my Linux workstation.

$ dpkg -l mono-runtime-common
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name                Version                            Architecture Description
+++-===================-==================================-============-=================================
ii  mono-runtime-common 6.10.0.104-0xamarin16+ubuntu2004b1 amd64        Mono runtime - common files
$ dotnet --list-sdks
3.1.301 [/usr/share/dotnet/sdk]

[Maarten Boekhold]

Seems I forgot to attached the screenshots I was referring to.

[topi]

Hi there,
working on
- Linux Mint 20.0, Mono from the Mint repositories as well as with the PPA from the Mono-Project (Mono 6.12.0)
- Linux Mint 20.1, Mono from the Mint repositories as well as with the PPA from the Mono-Project (Mono 6.12.0)
yields the same results as Maarten mentioned in this thread. So I know NAPS2 from Windows 10 where it works just fine and I would love to use it that way on Linux, too.

[MHB]

Can confirm on Ubuntu 18.04 LXDE and Debian 11 LXDE
- Mono 6.12.122 same result as described by Maarten

[César Tejeda Hernández]

I have the same symptoms, but all I did was to download the linux 64bit version from here: https://www.naps2.com/download.html and install the requested packages with apt ( mono-devel (6.8)
sane-utils, tesseract-ocr, tesseract-ocr-eng and tesseract-ocr-spa ) on a fresh new Ubuntu 21.10. I tried installing also the packages libcanberra-gtk-module libcanberra-gtk3-module because of some messages that appeared on the terminal, but I got nothing.