run as user:
ubuntu@u2:~$ asciidoctor-multipage
/usr/local/bin/asciidoctor-multipage:25:in load': cannot load such file -- /var/lib/gems/3.0.0/gems/asciidoctor-multipage-0.0.16/bin/asciidoctor-multipage (LoadError) from /usr/local/bin/asciidoctor-multipage:25:in'
errors.
/var/lib/gems/3.0.0/gems/asciidoctor-multipage-0.0.16/bin/asciidoctor-multipage is installed with: -rwxr-x--x permissions.
after: apt install ruby-rubygems gem install asciidoctor-multipage
run as user: ubuntu@u2:~$ asciidoctor-multipage /usr/local/bin/asciidoctor-multipage:25:in'
load': cannot load such file -- /var/lib/gems/3.0.0/gems/asciidoctor-multipage-0.0.16/bin/asciidoctor-multipage (LoadError) from /usr/local/bin/asciidoctor-multipage:25:in
errors.
/var/lib/gems/3.0.0/gems/asciidoctor-multipage-0.0.16/bin/asciidoctor-multipage is installed with: -rwxr-x--x permissions.
chmod +r /var/lib/gems/3.0.0/gems/asciidoctor-multipage-0.0.16/bin/asciidoctor-multipage
fixes the problem.