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I was having the same issue.

But it actually worked for me when using melodic. I was originally running a foxy version container but thought I was running melodic. I changed to running a melodic version container and roscore was not found.

Until I ran source ros_entrypoint.sh. Then roscore magically worked.

I don't know if my issue was fixed because I restarted a new container but it worked for me using the melodic container and not the foxy version which I believe or ros2.

Just wanted to give my experience in case it helps anyone.