sudo ubuntu-device-flash personal rolling --channel edge -o personal_x86.img --developer-mode
Determining oem configuration
Starting download of generic-amd64
41.70 KB / 41.70 KB [====================================] 100.00 % 749.03 KB/s 
Done
Starting download of icon for package
38.97 KB / 38.97 KB [====================================] 100.00 % 588.92 KB/s 
Done
Fetching information from server...
Downloading and setting up...
78.75 MB / 78.75 MB [======================================] 100.00 % 2.74 MB/s 
469.88 MB / 469.88 MB [====================================] 100.00 % 5.70 MB/s 
Installing generic-amd64
Starting download of generic-amd64
41.70 KB / 41.70 KB [====================================] 100.00 % 731.44 KB/s 
Done
Starting download of icon for package
38.97 KB / 38.97 KB [====================================] 100.00 % 656.34 KB/s 
Done
failed to find user uid/gid
generic-amd64 failed to install: unpack /tmp/generic-amd64759622676 to /tmp/diskimage865121609/system/oem/generic-amd64/1.4 failed with exit status 1