[Koha] installation error "yaz" on ubuntu 9.10

[Yatheesh Y]

i am getting following error

what is " yaz"  ?

can any one help me


sudo apt-get install zip unzip lamp-server^ yaz idzebra-2.0 dselect

Reading package lists... Done
Building dependency tree
Reading state information... Done
zip is already the newest version.
unzip is already the newest version.
libwrap0 is already the newest version.
tcpd is already the newest version.
ssl-cert is already the newest version.
libwrap0 is already the newest version.
tcpd is already the newest version.
ssl-cert is already the newest version.
Package yaz is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
E: Package yaz has no installation candidate

-- 
----------------------------
Y.Yatheesh babu
Librarian
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