The same worked for me.
- Use the 'Full unroot' button in SuperSU - Reinstall SuperSU and the Ubuntu Installer - Restart installation
On Nexus 4 with android 4.4.2
The same worked for me.
- Use the 'Full unroot' button in SuperSU
- Reinstall SuperSU and the Ubuntu Installer
- Restart installation
On Nexus 4 with android 4.4.2