I am in the process of Citrix Workspace on Ubuntu Mate. I have followed the directions provided at this link: https://jamesjmeyer210.github.io/site/blogs/installing-citrix-workspace-on-ubuntu.html
However this command specified on the page for certificate setup fails:
$ exec ctx_reash
bash: exec: ctx_rehash: not found
Running exec without any parameters completes silently, so bash definitely recognizes the command.
I have searched the internet and most of the example show redirect after "exec" and before the file specified.
I had the same challenge (Mint 20.2)
In my case I just ran the ctx_hash file by going to the relevant directory and typing
./ctx_hash
that worked, "exec ctx_hash" will not work. But the file is executable so I didn't need to change permissions or anything and was able to run it fine. This resolved the problem.