Update acrobat reader "9.1.0-7intrepid1" encounter error

[plynoi]

Binary package hint: acroread

Now I using Ubuntu 8.10 kernal 2.6.27-11-generic
Current acrobat is
Installed: 8.1.3-0medibuntu0.8.10.2
  Candidate: 9.1.0-7intrepid1
  Version table:
     9.1.0-7intrepid1 0
        500 http://archive.canonical.com intrepid/partner Packages
 *** 8.1.3-0medibuntu0.8.10.2 0
        100 /var/lib/dpkg/status

Ubuntu notify me that the new version is available, I updated via Update manager but the error occur when installed pacakge. The log show the following message

"E: /var/cache/apt/archives/acroread_9.1.0-7intrepid1_i386.deb: trying to overwrite `/usr/share/man/man1/acroread.1.gz', which is also in package acroread-debian-files"

See screenshot in attachment file please.

ProblemType: Package
Architecture: i386
DistroRelease: Ubuntu 8.10
ErrorMessage: trying to overwrite `/usr/share/man/man1/acroread.1.gz', which is also in package acroread-debian-files
Package: acroread 8.1.3-0medibuntu0.8.10.2
SourcePackage: acroread
Title: package acroread 8.1.3-0medibuntu0.8.10.2 failed to install/upgrade: trying to overwrite `/usr/share/man/man1/acroread.1.gz', which is also in package acroread-debian-files
Uname: Linux 2.6.27-11-generic i686

[plynoi (plynoi)]

more error screen shot.