Quote:
Originally Posted by Volkan
Downloading tarball signature securely...
Using previously downloaded calibre-2.20.0-i686.txz
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The i686 in the file name indicates that this version is for use on an Intel processor, while the Pi has an ARM processor.
You will need to either find a version already built for ARM (it is not done as part of the weekly releases) or build it yourself from source. Building it from source is likely to be non-trivial because of the large number of dependencies, but it has been done for earlier Calibre releases.