The source for Libatomic will be Ubuntu Package Search again:
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In a web browser, go to
https://packages.ubuntu.com -
This time use the Search the contents of packages form to search.
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Set Keyword to
libatomic.so.1 -
Select packages that contain files named like this.
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Set Distribution to
xenial -
Set Architecture to
amd64 -
Click Search.
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This time the results page lists a lot of packages. But with the background knowledge that IGEL OS libraries are located in
/usr/lib/x86_64-linux-gnu/you will find that libatomic1 is the desired package. Download it to a local directory on your Linux workstation.