Ubuntu installation breaks Japanese file names on FAT32 patition

I found /var/log/fsck/checkfs includes rename log. attaching.

This seem to be because running dosfsck on FAT32 patition when ubuntu boots up.
But dosfsck has problem of multibyte characters - see #49217.

Ubuntu installer writes /etc/fstab as follows:
# /dev/sda1
UUID=3F19-1E0C /windows vfat utf8,umask=007,gid=46 0 1

To avoid running dosfsck on FAT32, this should be as follws:
# /dev/sda1
UUID=3F19-1E0C /windows vfat utf8,umask=007,gid=46 0 0

I'm not sure this solution is harmful or not for other languages, but parhaps it is no need to run fsck on windows patition.

There has been a lot of discussion among the participants of Ubuntu Japanese Kaizen project which confirms the problem. I don't have Windows. Kobayashi-San is this a duplicate of bug 49327?

> Kobayashi-San is this a duplicate of bug 49327?

Sorry, I meant bug 49217

FWIW, a simple "sudo dosfsck /dev/sdb1" on my USB stick which has Japanese file names on it did not break things. But I have been mostly using this stick from Linux and only occasionally from a friend's computer with Windows.

> > Kobayashi-San is this a duplicate of bug 49327?
>
> Sorry, I meant bug 49217
>

bug 49217 seem to be a part of this bug.
The point of this bug is Ubuntu instllation process breaks
user's windows environment.

> FWIW, a simple "sudo dosfsck /dev/sdb1" on my USB stick which has
> Japanese file names on it did not break things. But I have been mostly
> using this stick from Linux and only occasionally from a friend's
> computer with Windows.

dosfsck seems to break filenames which includes 0x5c, this code equal to
the code of \(back slash).
I made some files includes 0x5c in my USB stick on windows, and then
connected it to Ubuntu box, run "sudo dosfsck -a /dev/sdb1", and those
files are renamed.

$ sudo mount /dev/sdc1 /mnt
$ ls /mnt
噂.txt 暴.txt 禄.txt
$ sudo umount /mnt
$ sudo dosfsck -a /dev/sdc1
dosfsck 2.11, 12 Mar 2005, FAT32, LFN
/:5P2.txt
  Bad file name.
  Auto-renaming it.
  Renamed to 000\0000000.\000XT
/:6Qq.txt
  Bad file name.
  Auto-renaming it.
  Renamed to 001\0000000.\000XT
/:7c4.txt
  Bad file name.
  Auto-renaming it.
  Renamed to 002\0000000.\000XT
Performing changes.
/dev/sdc1: 3 files, 1/501040 clusters
$ sudo mount /dev/sdc1 /mnt
$ ls /mnt
000 001 002

Yes, this is a duplicate of bug 49327, and following is a patch (against dosfsck/check.c) to solve it.

- char *bad_chars = atari_format ? "*?\\/:" : "*?<>|\"\\/:";
+ char *bad_chars = atari_format ? "*?/:" : "*?<>\"/:";