What norns version were you running previous to this? Which Pi are you on?
You could try running the samba install from the original update script and see if that helps (since it changes the python2.7 stuff) - and then try to ./waf norns again
you would need to grab the update tar file from github, then upload the .tgz file your device in the ~/update directory, then something like
(EDIT - added the wget for the update file to the commands below)
cd ~/update
wget https://github.com/monome/norns/releases/download/v2.2.5/norns191230.tgz
tar -xvf norns191230.tgz
cd 191230
sudo dpkg -i packages/*.deb
(echo "sleep"; echo "sleep") | sudo smbpasswd -s -a we
sudo cp config/smb.conf /etc/samba/
sudo /etc/init.d/samba restart