I had the same issue on my nexus 4 I had to do the following to get ubuntu-system:
1. Install cdimage with bootstrap phablet-flash cdimage-touch -b
2. after it is there and working install ubuntu system one phablet-flash ubuntu-system
I had the same issue on my nexus 4 I had to do the following to get ubuntu-system:
1. Install cdimage with bootstrap
phablet-flash cdimage-touch -b
2. after it is there and working install ubuntu system one
phablet-flash ubuntu-system