Digikam AppImage and installed application

[TD]

Hello,
I am using Digikam via AppImage:     digikam-5.4.0-01-x86-64.appimage

However, I cannot use the "Open with default" action
(Image > Open with default application  Maj+F4)

I get the following error:
    digikam.geoiface: ----
    This application failed to start because it could not find or load the Qt platform plugin "xcb"
    in "".

    Reinstalling the application may fix this problem.
    Aborted


The kipi-panorama is not working either (hugin, autooptimiser, enblend, ...) are not found, despite hugin is working when called directelyError message:    
digikam.general: Testing  "autooptimiser" ...
digikam.general: "autooptimiser"  help header line: 
 "autooptimiser: /tmp/.mount_j2jkvT/usr/lib/libtiff.so.5: no version information available (required by /usr/lib/x86_64-linux-gnu/libpano13.so.3)"
digikam.general: Testing  "cpclean" ...
digikam.general: "cpclean"  help header line: 
 "cpclean: /tmp/.mount_j2jkvT/usr/lib/libtiff.so.5: no version information available (required by /usr/lib/x86_64-linux-gnu/libpano13.so.3)"
digikam.general: Testing  "cpfind" ...
digikam.general: "cpfind"  help header line: 
 "cpfind: /tmp/.mount_j2jkvT/usr/lib/libtiff.so.5: no version information available (required by /usr/lib/libvigraimpex.so.5)"
digikam.general: "cpfind"  help header line: 
 "cpfind: /tmp/.mount_j2jkvT/usr/lib/libtiff.so.5: no version information available (required by /usr/lib/x86_64-linux-gnu/libpano13.so.3)"
digikam.general: "cpfind"  help header line: 
 "cpfind: /tmp/.mount_j2jkvT/usr/lib/libtiff.so.5: no version information available (required by /usr/lib/hugin/libhuginbase.so.0.0)"
digikam.general: "cpfind"  help header line: 
 "Hugin's cpfind 2015.0.0.cdefc6e53a58"
digikam.general: Found  "cpfind"  version:  "2015.0.0"
digikam.general: Testing  "enblend" ...
digikam.general: "enblend"  help header line: 
 "enblend: /tmp/.mount_j2jkvT/usr/lib/libtiff.so.5: no version information available (required by enblend)"
digikam.general: Testing  "make" ...
digikam.general: "make"  help header line: 
 "GNU Make 4.1"
digikam.general: Found  "make"  version:  "4.1"
digikam.general: Testing  "nona" ...
digikam.general: "nona"  help header line: 
 "nona: /tmp/.mount_j2jkvT/usr/lib/libtiff.so.5: no version information available (required by /usr/lib/x86_64-linux-gnu/libpano13.so.3)"
digikam.general: Testing  "pano_modify" ...
digikam.general: "pano_modify"  help header line: 
 "pano_modify: /tmp/.mount_j2jkvT/usr/lib/libtiff.so.5: no version information available (required by /usr/lib/x86_64-linux-gnu/libpano13.so.3)"
digikam.general: Testing  "pto2mk" ...
digikam.general: Testing  "hugin_executor" ...
digikam.general: Found  "hugin_executor"
digikam.general: Starting Main Thread
digikam.general: Testing  "autooptimiser" ...
digikam.general: "autooptimiser"  help header line: 
 "autooptimiser: /tmp/.mount_j2jkvT/usr/lib/libtiff.so.5: no version information available (required by /usr/lib/x86_64-linux-gnu/libpano13.so.3)"
digikam.general: Testing  "autooptimiser" ...
digikam.general: "autooptimiser"  help header line: 
 "autooptimiser: /tmp/.mount_j2jkvT/usr/lib/libtiff.so.5: no version information available (required by /usr/lib/x86_64-linux-gnu/libpano13.so.3)"
digikam.general: Testing  "cpclean" ...
digikam.general: "cpclean"  help header line: 
 "cpclean: /tmp/.mount_j2jkvT/usr/lib/libtiff.so.5: no version information available (required by /usr/lib/x86_64-linux-gnu/libpano13.so.3)"
digikam.general: Testing  "enblend" ...
digikam.general: "enblend"  help header line: 
 "enblend: /tmp/.mount_j2jkvT/usr/lib/libtiff.so.5: no version information available (required by enblend)"
digikam.general: Testing  "nona" ...
digikam.general: "nona"  help header line: 
 "nona: /tmp/.mount_j2jkvT/usr/lib/libtiff.so.5: no version information available (required by /usr/lib/x86_64-linux-gnu/libpano13.so.3)"
digikam.general: Testing  "pano_modify" ...
digikam.general: "pano_modify"  help header line: 
 "pano_modify: /tmp/.mount_j2jkvT/usr/lib/libtiff.so.5: no version information available (required by /usr/lib/x86_64-linux-gnu/libpano13.so.3)"
digikam.general: Testing  "autooptimiser" ...
digikam.general: "autooptimiser"  help header line: 
 "autooptimiser: /tmp/.mount_j2jkvT/usr/lib/libtiff.so.5: no version information available (required by /usr/lib/x86_64-linux-gnu/libpano13.so.3)"
digikam.general: All Binaries Found :  false
digikam.general: Hugin >= 2015.0 :  false
digikam.general: Testing  "pto2mk" ...
digikam.general: Testing  "autooptimiser" ...
digikam.general: "autooptimiser"  help header line: 
 "autooptimiser: /tmp/.mount_j2jkvT/usr/lib/libtiff.so.5: no version information available (required by /usr/lib/x86_64-linux-gnu/libpano13.so.3)"
digikam.general: All Binaries Found :  falseIs something to be set up so that digikam can use the (already) installed program ?
Thank for you help
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