AppImage Error: SUID Not Configured Correctly

Duplicate of #15 ; However, running sudo sysctl kernel.unprivileged_userns_clone=1 and --no-sandbox did not work.

kawanerio@KawaneLinux:~/Downloads$ /home/kawanerio/Downloads/PanWriter-0.8.9.AppImage 
[847671:0711/182008.205108:FATAL:setuid_sandbox_host.cc(163)] The SUID sandbox helper binary was found, but is not configured correctly. Rather than run without sandboxing I'm aborting now. You need to make sure that /tmp/.mount_PanWriGdG5Au/chrome-sandbox is owned by root and has mode 4755.
Trace/breakpoint trap (コアダンプ)

Tried running with --no-sandbox parameter, but now the application just hangs:

kawanerio@KawaneLinux:~/Downloads$ /home/kawanerio/Downloads/PanWriter-0.8.9.AppImage --no-sandbox
Error loading or parsing YAML file.ENOENT: no such file or directory, open '/home/kawanerio/.config/PanWriterUserData/settings.yaml'
Checking for update
Generated new staging user ID: 6a9ceadd-0f0c-5b76-b1e6-831929f7a687
Update for version 0.8.9 is not available (latest version: 0.8.9, downgrade is disallowed).
checkForUpdatesAndNotify called, downloadPromise is null

Upon visiting issue #15 , I've ran the following command: sudo sysctl kernel.unprivileged_userns_clone=1, however, the AppImage still fails to launch:

kawanerio@KawaneLinux:~/Downloads sudo sysctl kernel.unprivileged_userns_clone=1
[sudo] kawanerio のパスワード: 
kernel.unprivileged_userns_clone = 1
kawanerio@KawaneLinux:~/Downloads$ /home/kawanerio/Downloads/PanWriter-0.8.9.AppImage 
[849260:0711/182524.771993:FATAL:setuid_sandbox_host.cc(163)] The SUID sandbox helper binary was found, but is not configured correctly. Rather than run without sandboxing I'm aborting now. You need to make sure that /tmp/.mount_PanWrilgmgEq/chrome-sandbox is owned by root and has mode 4755.
Trace/breakpoint trap (コアダンプ)

Tried running with --no-sandbox parameter once again after the sudo sysctl kernel.unprivileged_userns_clone=1, but still hangs:

kawanerio@KawaneLinux:~/Downloads$ /home/kawanerio/Downloads/PanWriter-0.8.9.AppImage --no-sandbox
Error loading or parsing YAML file.ENOENT: no such file or directory, open '/home/kawanerio/.config/PanWriterUserData/settings.yaml'
Checking for update
Update for version 0.8.9 is not available (latest version: 0.8.9, downgrade is disallowed).
checkForUpdatesAndNotify called, downloadPromise is null

I am using Ubuntu.

Start with the AppImage launch command and the related issue #15, then compare the SUID sandbox failure with the repeated --no-sandbox output. The issue is resolved when the Ubuntu AppImage launches without the chrome-sandbox error or hanging after the missing settings.yaml message.