16:47 <rafaeldtinoco> sp.. 60-persistent-storage.rules sets the ID_SERIAL for 
USB devices
16:47 <rafaeldtinoco> it checks first for ATA then ATAPI (with ata_id command)
16:47 <rafaeldtinoco> if it does not work, it falls back to usb_id (from USB 
device descriptor)
16:48 <rafaeldtinoco> IF you install sg3-utils, it does not check if it is USB 
or not, it simply tries to put a serial in all SCSI devices (that might be 
using SCSI only for commands, and not the full SPEC) based on VPDs
16:48 <rafaeldtinoco> so ignoring USB devices for not having VPDs seems ok
16:48 <rafaeldtinoco> as they will be ATA/ATAPI devices (using SCSI commands 
only)
16:48 <rafaeldtinoco> now, not sure if there is a SCSI device (full 
implementation) over USB serial
16:49 <rafaeldtinoco> (like SAS disk over USB3 <- not sure in this case)
16:49 <rafaeldtinoco> but it looks broken for those cases either way
16:49 <rafaeldtinoco> as sg3-utils dont make any decision for different USB 
devices

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https://bugs.launchpad.net/bugs/1833618

Title:
  MAAS can't deploy Ubuntu if ID_SERIAL of any block device is broken
  (USB pendrive in this case).

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