Problem reading usb stick on Vivid

[Colin Law]

I am having problems reading usb sticks (actually sd cards in a usb
adaptor) on Vivid.  The particular image that is problematic is the
raspberry pi noobs image.   It is ok on a different machine running
14.04 but not on the one running Vivid.

The drive does not mount when I plug it in.
sudo fdisk -l
shows
Disk /dev/sdb: 7.3 GiB, 7861174272 bytes, 15353856 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x000981cb

Device     Boot   Start     End Sectors  Size Id Type
/dev/sdb1          2048 2818359 2816312  1.4G  e W95 FAT16 (LBA)
/dev/sdb2       2826240 7678975 4852736  2.3G 85 Linux extended
/dev/sdb3       7678976 7744511   65536   32M 83 Linux
/dev/sdb5       2834432 2998271  163840   80M  c W95 FAT32 (LBA)
/dev/sdb6       3006464 7677951 4671488  2.2G 83 Linux

gparted shows red exclamations against sdb1, sdb5, sdb6 and sdb3.
When I right click sdb6 and select Information it says
Warning
e2label: No such file or directory while trying to open /dev/sdb6
Couldn't find valid filesystem superblock.

tune2fs 1.42.12 (29-Aug-2014)

tune2fs: No such file or directory while trying to open /dev/sdb6
Couldn't find valid filesystem superblock.

Sdcards with other images I have are ok.  Another card with the noobs
image is not.

Any suggestions?

Colin