I got the same result.
I purged calibre from my system and then went ahead and did this:
Code:
sudo -v && wget -nv -O- https://raw.githubusercontent.com/kovidgoyal/calibre/master/setup/linux-installer.py | sudo python -c "import sys; main=lambda:sys.stderr.write('Download failed\n'); exec(sys.stdin.read()); main()"
Cloned a calibre fork from github and tried
Code:
sudo python setup.py develop
But I still get the icu error.