I also get this error on boot  on Ubuntu 15.04.

starting version 216
error: /dev/sdb: No medium found
error: /dev/sdb: No medium found

I'm runing 3.19.0-25-generic Linux.
if I run sudo fdisk - l 

Device     Boot     Start       End   Sectors   Size Id Type
/dev/sda1  *         2048    206847    204800   100M  7 HPFS/NTFS/exFAT
/dev/sda2          206848 321112255 320905408   153G  7 HPFS/NTFS/exFAT
/dev/sda3       601159680 625139711  23980032  11,4G  7 HPFS/NTFS/exFAT
/dev/sda4       321114110 601159679 280045570 133,5G  5 Extended
/dev/sda5       595394560 601159679   5765120   2,8G 82 Linux swap / Solaris
/dev/sda6       321114112 589627391 268513280   128G 83 Linux
/dev/sda7       589629440 595384319   5754880   2,8G 82 Linux swap / Solaris

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https://bugs.launchpad.net/bugs/1398025

Title:
  Error messages like "error: /dev/sdb: No medium found" on booting

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