Aha .. inspiration. I'm mounting manually ("mount /dev/cdrom /cdrom", a
mental regression to the days before /media/xxx!). If I do "mount
/media/cdrom0", everything is fine, presumably because my fstab has:

/dev/scd0       /media/cdrom0   udf,iso9660 user,noauto,exec,utf8 0
0

I'm guessing that some of the file system type probes that mount does
are causing the problem? /cdrom is a symlink to /media/cdrom, and
/media/cdrom is a symlink to /media/cdrom0, so maybe the problem being
seen is related to a change to either:

(A) symlink resolution when trying to match mount command line options to 
/etc/fstab, or
(B) the file system type probe process run by mount, which, according to the 
man-page, is:

"If no -t option is given, or if the auto type is specified, mount will  try  
to  guess  the  desired  type.
Mount  uses  the blkid or volume_id library for guessing the filesystem type; 
if that does not turn up any‐
thing that looks familiar, mount will try to read the file /etc/filesystems, 
or, if that  does  not  exist,
/proc/filesystems.   All  of  the  filesystem  types  listed there will be 
tried, except for those that are
labeled "nodev" (e.g., devpts, proc and nfs).  If /etc/filesystems ends in a 
line with  a  single  *  only,
mount will read /proc/filesystems afterwards."

Any help to anybody?

-- 
CD/RW Mount Problems with Intrepid
https://bugs.launchpad.net/bugs/293570
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