You could always try locate
$ sudo apt install -y locate
$ sudo updatedb
$ locate libc.so
/usr/lib/arm-linux-gnueabihf/libc.so
/usr/lib/arm-linux-gnueabihf/libc.so.6
$
You'll need to run
updatedb
to initially populate the locate database if you want to run it right away. Otherwise the installed package will set up a cron job to run updatedb overnight.
Be aware that
locate
only shows you files that
you can see. This means that files that are in directories that you do not have search access to will not be shown. But you can always
sudo locate somefile
to run it as root, which should be able to locate any file on the system.