I am trying to install Xenomai along with the Linux kernel version 4.4.43 in my PC. It is currently running Ubuntu 16.04 LTS. I am new to the whole Linux enviroment and from what I read online doing sudo apt-get update seemed like a good thing to do first. But I keep getting the same error saying Failed to fetch .......... 500 Operation not permitted I really have no idea what I am doing wrong.

In addition to this, I need to install OpenSSL for Xenomai. But sudo apt-get install libssl-dev tells me that it could not find the package.

I have tried to change the sources.list to use old source, but there was no change. The other software page has all options selected as well.

I have attached both images below in order. Please advice as to what I should do next.


Unable to find package

EDIT: I have tried multiple different servers, including archive servers, but there is not difference in the output. What could be something on my end that is going wrong?

  • It may have been just a temporary problem with the server in.archive.ubuntu.com, judging from the fact that it can't find a Release File that should obviously be there. – Jos Mar 7 '18 at 12:32
  • Are you behind a firewall that requires a http-proxy? – Simon Sudler Mar 7 '18 at 13:47
  • @Jos I tried using the main server option as well, but saw no change. Should I just keep trying different servers? – Michael Thomas Mar 8 '18 at 3:40
  • @SimonSudler No. I am doing from my office and I just confirmed that there is not http-proxy requirement. – Michael Thomas Mar 8 '18 at 3:43

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