Linux executable is throwing a tantrum.

klist what is the error?
ldd klist what happens?
/.kilst means at the root folder find a file .klist
ldd is a way to make sure all libraries that the application may rely on are installed.
file klist will tell you whether it is a binary or a script file

klinit should be kinit.

Did you configure the authentication to tie into the AD?
usually kerbeerous is setup after the system is joined to the domain net join ads ...
or use the GUI tools to do the same.

Hi Arnold, klist returns "bash: /usr/local/krb5/bin/klist: No such file or directory"l
ldd klist is interesting, "not a dynamic executable"

I don't follow your last paragraph, my bad. If this were successful then kinit would prompt me for my principal name, domain, password, and Yubikey code, returning a ticket. With the ticket I can ssh/putty into a remote server with GSSAPI credentials.

Your reply prompted me to start searching for the string "cannot execute binary file". One site, https://www.unix.com/red-hat/247751-cannot-execute-binary-file.html, led me to recheck that the machine is (uname) is x86_64. As I recall, the binaries came from a 32-bit source. I'm thinking to remove the krb5 directories and to reinstall from the 64-bit source.

Did you install Kerberos from the Ubuntu install kit, or from the source kit?

If it was built from the source kit then it's very likely that it won't work at all, because it builds into directories other than the places that the Ubuntu executables expect them.

Since you said, "The installation script for Windows from the same source runs without error."

Likely the problem is you used an "installation script", which will almost surely fail.

You should have installed one of these Ubuntu Focal packages, to have klinit available...

net17 # klinit

Command 'klinit' not found, did you mean:

  command 'kinit' from deb heimdal-clients (7.7.0+dfsg-1ubuntu1)
  command 'kinit' from deb krb5-user (1.17-6ubuntu4)

Try: apt install <deb name>

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Suggestion: Remove whatever you installed. Install one of the 2x packages above. Retest.

Is SELinux in enforcing mode?... Then programs may not be allowed to access various protected resources.