I can confirm that using the binary from http://calibre-ebook.com/download_linux has solved the problem for me.
Distrubuted version by Ubuntu: 2.20.0+dfsg-1 Installed binary version: 2.31
I can confirm that using the binary from http:// calibre- ebook.com/ download_ linux has solved the problem for me.
Distrubuted version by Ubuntu: 2.20.0+dfsg-1
Installed binary version: 2.31