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I am new in ubuntu and i am trying to download ROS at the moment. the idea of repository keyrings are still new. However i am getting somewhere and making progress. this error seems to render my installation useless, please help me out of this. I have tried the ls/etc/apt/sources.list.d and rm files.. but nothing happened. the next message tells me to 'Manage keyring files in trusted.gpg.d instead' what to do please guide. thanks

Arsalan Moheyuddin
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    Does this answer your question? [What commands (exactly) should replace the deprecated apt-key?](https://askubuntu.com/questions/1286545/what-commands-exactly-should-replace-the-deprecated-apt-key) – Artur Meinild Apr 07 '21 at 16:37
  • However, apt-key is still working, but you should consider other options, as mentioned in the post I linked to. – Artur Meinild Apr 07 '21 at 17:21

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