Ubuntu 20.04; how to import a color profile

I'd appreciate help to find a description that actually works for 20.04 as these three pages have the same text:

• https://help.ubuntu.com/20.04/ubuntu-help/color-howtoimport.html.en
• https://help.ubuntu.com/lts/ubuntu-help/color-howtoimport.html.en
  for 22.04
• https://help.ubuntu.com/stable/ubuntu-help/color-howtoimport.html.en which apparently is for 23.04

For starters there is no Add profile in my long standing and stable 20.04. (ref to texts above)

I have a profile created with

$ flatpak list
...
DisplayCAL        net.displaycal.DisplayCAL       3.8.9.3 ...

... that I cannot figure out how to get into use.

$ dispwin -d 1 profile-name #fails to install the profile

Adding -D doesn't appear to tell about any failures... just that it "succeeds", at the very end.

oh...

Dispwin: Warning - new_dispwin: Expected VideoLUT depth 11 doesn't match actual 10
new_dispwin: DirectColor fdepth 8, rdepth 11, ndepth 10, edepth 16, r/g/b shifts 16 8 0

... in the midst of it; but would a warning be critical enough to stop it?

The actual dispwin run:

$ dispwin -D2 -d 1 -I profile-name # Long complicated name replaced
get_a_display called with ix 0
get_displays using 1 XRandR Screens
XRRGetCrtcInfo of Screen 0 CRTC 0 has 1 Outputs Valid Mode
Checking XRandR 1.2 VideoLUT access
Adding Screen 0 CRTC 0 Output 0
Display 0 name = ':1.0'
Root atom '_ICC_PROFILE'
Got EDID for display
XRRGetCrtcInfo of Screen 0 CRTC 1 has 0 Outputs No Mode
CRTC skipped as it has no mode or no outputs
XRRGetCrtcInfo of Screen 0 CRTC 2 has 0 Outputs No Mode
CRTC skipped as it has no mode or no outputs
XRRGetCrtcInfo of Screen 0 CRTC 3 has 0 Outputs No Mode
CRTC skipped as it has no mode or no outputs
XRRGetCrtcInfo of Screen 0 CRTC 4 has 0 Outputs No Mode
CRTC skipped as it has no mode or no outputs
XRRGetCrtcInfo of Screen 0 CRTC 5 has 0 Outputs No Mode
CRTC skipped as it has no mode or no outputs
XRRGetCrtcInfo of Screen 0 CRTC 6 has 0 Outputs No Mode
CRTC skipped as it has no mode or no outputs
 Selected ix 0 ':1.0' Monitor 1, Output eDP-1-1 at 0, 0, width 1920, height 1080'
new_dispwin called
using ucmm for profile installation
new_dispwin: Opened display ':1.0' OK
Dispwin: Warning - new_dispwin: Expected VideoLUT depth 11 doesn't match actual 10
new_dispwin: DirectColor fdepth 8, rdepth 11, ndepth 10, edepth 16, r/g/b shifts 16 8 0
dispwin_get_ramdac called
Getting gamma using Randr 1.2
dispwin_get_ramdac returning OK
Saved original VideoLUT
new_dispwin: return successfully
dispwin_install_profile 'profile-name'
Setting _ICC_PROFILE property
dispwin_set_ramdac called
Setting gamma using Randr 1.2
dispwin_set_ramdac returning OK
dispwin_del called
dispwin_set_ramdac called
Setting gamma using Randr 1.2
dispwin_set_ramdac returning OK
dispwin_set_ramdac called
Setting gamma using Randr 1.2
dispwin_set_ramdac returning OK
Restored original ramdac
About to close display
finished

$ 

Found descriptions and seemingly related info:

• 2015-ish:
  Import .icm color profile from Windows
• 2017-ish: (hmm... need to try one there)
  How do you set system display color profiles in Xubuntu and Lubuntu?
• Related, stating success for 20.04:
  Ubuntu 22.04 display color calibration problem
• bugzilla, redhat fedora, closed as "old", still exists(?):
  https://bugzilla.redhat.com/show_bug.cgi?id=1372046
• DisplayCal discussion:
  https://sourceforge.net/p/dispcalgui/discussion/932493/thread/d34dcfb8/

Attempting use colormgr:

$ colormgr get-devices-by-kind display 
Object Path:   /org/freedesktop/ColorManager/devices/xrandr_LG_Display_hannu_1000
Owner:         hannu
Created:       april 22 2023, 10:55:40 AM
Modified:      april 22 2023, 11:57:35 AM
Type:          display
Enabled:       Yes
Embedded:      Yes
Model:         ROG Strix G731GU G731GU
Vendor:        ASUSTeK
Serial:        unknown
Scope:         temp
Colorspace:    rgb
Device ID:     xrandr-LG Display
Profile 1:     icc-872195e4138bb957759682f72dc25e78
               /home/hannu/.local/share/icc/edid-58ca53ac7e2a452fe10e1e7100e16186.icc
Profile 2:     icc-470b65b1eb4cb2e297533d97643e38ab
               /var/lib/gdm3/.local/share/icc/edid-58ca53ac7e2a452fe10e1e7100e16186.icc
Profile 3:     icc-49fd7c8b33ac3fe8121f6a9f5b480cd4
               /home/hannu/.local/share/icc/step4.icc
Metadata:      OutputEdidMd5=58ca53ac7e2a452fe10e1e7100e16186
Metadata:      OutputPriority=primary
Metadata:      XRANDR_name=eDP-1-1
Metadata:      OwnerCmdline=/usr/libexec/gsd-color 

$ ll 
total 796
-rw-rw-r-- 1 hannu hannu 811088 2023-04-22 13:42 step4.icc

$ colormgr device-add-profile  /org/freedesktop/ColorManager/devices/xrandr_LG_Display_hannu_1000 step4.icc 
profile id 'step4.icc' does not exist

$ colormgr device-add-profile "xrandr-LG Display" step4.icc 
profile id 'step4.icc' does not exist

Based on "desc" fields visible in strings step4.icc, also in text fields in DisplayCal (GUI) when creating the profile, and also as original filename:

$ mv step4.icc '2023-04-22 11-07 -- LP173WFG-SPB1 #1  2.2 VF-F XYZLUT+MTX'

$ ll
total 800
-rw-r--r-- 1 hannu hannu 811088 2023-04-22 13:07 '2023-04-22 11-07 -- LP173WFG-SPB1 #1  2.2 VF-F XYZLUT+MTX'
-rw-rw-r-- 1 hannu hannu   1372 2021-03-11 19:04  edid-58ca53ac7e2a452fe10e1e7100e16186.icc

$ colormgr device-add-profile "xrandr-LG Display" 2023-04-22\ 11-07\ --\ LP173WFG-SPB1\ #1\ \ 2.2\ VF-F\ XYZLUT+MTX
profile id '2023-04-22 11-07 -- LP173WFG-SPB1 #1  2.2 VF-F XYZLUT+MTX' does not exist

$ colormgr device-add-profile "xrandr-LG Display" "2023-04-22\ 11-07\ --\ LP173WFG-SPB1\ #1\ \ 2.2\ VF-F\ XYZLUT+MTX"
profile id '2023-04-22\ 11-07\ --\ LP173WFG-SPB1\ #1\ \ 2.2\ VF-F\ XYZLUT+MTX' does not exist

$

One more thing to try:
https://wiki.ubuntuusers.de/Monitor_profilieren_mit_ArgyllCMS/