While running SAGA 7.30 version in QGIS 3.16, they show an error that version is not supporting and checking about a new version for up-gradation that might solve the issue but the 7.30 version is the newest.
How can I fix this problem?
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The SAGA 'Fill sinks' algorithm works here in QGIS 3.16.0 running in Ubuntu 20.04 with SAGA version 7.3.0. It throws a warning but not an error and the result appears to be fine. Try the following:
Firstly, in the Processing Toolbox options deactivate SAGA.
Secondly, install the QGIS plugin 'Processing Saga NextGen Provider'.
Thirdly, in the Processing Toolbox options under SAGANG, set the 'SAGA folder' to '/usr/bin'.
At this stage try running the 'Fill sinks' algorithm, if it doesn't work let us know what error messages are generated.
I have worked around the same issue. Actually the current SAGA version is 7.8.1 (see here: https://sourceforge.net/projects/saga-gis/files/SAGA%20-%207/SAGA%20-%207.8.1/), but it has not yet made it to the ubuntu repositories. There is a tar.gz to download from the saga folder for linux distros, though I have not managed to get it to run on ubuntu 20.04, but maybe you have better luck (or someone else here can help us on this).
My workaround for now: