Beryl の本家サイト
http://www.beryl-project.org/
に以下のような文章があります。
> Beryl and Compiz (at least the extra plugins division of compiz) have merged. Please all welcome Compiz Fusion! You'll find the new forums at http://forum.compiz-fusion.org.
　つまりこれからは compiz-fusion を使えってことですね。だからどのリポジトリにも登録されていないんじゃないでしょうか。

　一応私の sources.list を貼り付けておきます。

deb cdrom:[Ubuntu 7.10 _Gutsy Gibbon_ Japanese Remix - Release i386 (20071018)]/ gutsy main restricted
# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.

# Line commented out by installer because it failed to verify:
# deb http://jp.archive.ubuntu.com/ubuntu/ gutsy main restricted
# Line commented out by installer because it failed to verify:
# deb-src http://jp.archive.ubuntu.com/ubuntu/ gutsy main restricted

## Major bug fix updates produced after the final release of the
## distribution.
# Line commented out by installer because it failed to verify:
# deb http://jp.archive.ubuntu.com/ubuntu/ gutsy-updates main restricted
# Line commented out by installer because it failed to verify:
# deb-src http://jp.archive.ubuntu.com/ubuntu/ gutsy-updates main restricted

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team, and may not be under a free licence. Please satisfy yourself as to
## your rights to use the software. Also, please note that software in
## universe WILL NOT receive any review or updates from the Ubuntu security
## team.
# Line commented out by installer because it failed to verify:
# deb http://jp.archive.ubuntu.com/ubuntu/ gutsy universe
# Line commented out by installer because it failed to verify:
# deb-src http://jp.archive.ubuntu.com/ubuntu/ gutsy universe
# Line commented out by installer because it failed to verify:
# deb http://jp.archive.ubuntu.com/ubuntu/ gutsy-updates universe
# Line commented out by installer because it failed to verify:
# deb-src http://jp.archive.ubuntu.com/ubuntu/ gutsy-updates universe

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team, and may not be under a free licence. Please satisfy yourself as to
## your rights to use the software. Also, please note that software in
## multiverse WILL NOT receive any review or updates from the Ubuntu
## security team.
# Line commented out by installer because it failed to verify:
# deb http://jp.archive.ubuntu.com/ubuntu/ gutsy multiverse
# Line commented out by installer because it failed to verify:
# deb-src http://jp.archive.ubuntu.com/ubuntu/ gutsy multiverse
# Line commented out by installer because it failed to verify:
# deb http://jp.archive.ubuntu.com/ubuntu/ gutsy-updates multiverse
# Line commented out by installer because it failed to verify:
# deb-src http://jp.archive.ubuntu.com/ubuntu/ gutsy-updates multiverse

## Uncomment the following two lines to add software from the 'backports'
## repository.
## N.B. software from this repository may not have been tested as
## extensively as that contained in the main release, although it includes
## newer versions of some applications which may provide useful features.
## Also, please note that software in backports WILL NOT receive any review
## or updates from the Ubuntu security team.
# deb http://jp.archive.ubuntu.com/ubuntu/ gutsy-backports main restricted universe multiverse
# deb-src http://jp.archive.ubuntu.com/ubuntu/ gutsy-backports main restricted universe multiverse

## Uncomment the following two lines to add software from Canonical's
## 'partner' repository. This software is not part of Ubuntu, but is
## offered by Canonical and the respective vendors as a service to Ubuntu
## users.
# deb http://archive.canonical.com/ubuntu gutsy partner
# deb-src http://archive.canonical.com/ubuntu gutsy partner

# Line commented out by installer because it failed to verify:
# deb http://security.ubuntu.com/ubuntu gutsy-security main restricted
# Line commented out by installer because it failed to verify:
# deb-src http://security.ubuntu.com/ubuntu gutsy-security main restricted
# Line commented out by installer because it failed to verify:
# deb http://security.ubuntu.com/ubuntu gutsy-security universe
# Line commented out by installer because it failed to verify:
# deb-src http://security.ubuntu.com/ubuntu gutsy-security universe
# Line commented out by installer because it failed to verify:
# deb http://security.ubuntu.com/ubuntu gutsy-security multiverse
# Line commented out by installer because it failed to verify:
# deb-src http://security.ubuntu.com/ubuntu gutsy-security multiverse

# Line commented out by installer because it failed to verify:
# Line commented out by installer because it failed to verify:
deb-src http://archive.ubuntulinux.jp/ubuntu-ja gutsy/
# Line commented out by installer because it failed to verify:
deb http://archive.ubuntulinux.jp/ubuntu-ja gutsy-ja/
# Line commented out by installer because it failed to verify:
deb http://ftp.jaist.ac.jp/pub/Linux/ubuntu/ gutsy main universe restricted multiverse
deb-src http://ftp.jaist.ac.jp/pub/Linux/ubuntu/ gutsy universe main multiverse restricted #Added by software-properties
deb http://security.ubuntu.com/ubuntu/ gutsy-security universe main multiverse restricted
deb-src http://security.ubuntu.com/ubuntu/ gutsy-security universe main multiverse restricted
deb http://ftp.jaist.ac.jp/pub/Linux/ubuntu/ gutsy-updates universe main multiverse restricted
deb-src http://ftp.jaist.ac.jp/pub/Linux/ubuntu/ gutsy-updates universe main multiverse restricted
deb-src http://archive.ubuntulinux.jp/ubuntu-ja gutsy-ja/
deb http://eric.lavar.de/comp/linux/debian/ experimental/
deb-src http://eric.lavar.de/comp/linux/debian/ experimental/
deb http://repository.akirad.net akirad-gutsy main
deb http://packages.medibuntu.org/ gutsy free non-free
deb-src http://packages.medibuntu.org/ gutsy free non-free

　これでもやっぱりヒットしません。公式なリポジトリでは公開されていないと考える方が自然です。

最後の編集者: avidya (2008-03-11 05:01:30)

BerylとCompiz Fusionについては、他の方が説明していらっしゃる通りです。

というわけで、もし7.10をお使いなら下記のURL（リポジトリであってます）はすべて削除しておいた方が良いです。余計なトラブルの元になるかもしれないので。

kaorufree による投稿:

deb http://jp.archive.ubuntu.com/ubuntu/ feisty universe
deb http://ubuntu.beryl-project.org feisty main
#deb-src http://ubuntu.beryl-project.org feisty main
#deb http://archive.ubuntulinux.jp/ubuntu-ja feisty/
#deb http://archive.ubuntulinux.jp/ubuntu-ja feisty-ja/
#deb http://download.tuxfamily.org/3v1deb feisty eyecandy
#deb-src http://download.tuxfamily.org/3v1deb feisty eyecandy
#deb http://www.albertomilone.com/drivers/edgy/latest/32bitbinary/
#deb http://download.tuxfamily.org/3v1debedgyberyl-svn feisty eyecandy
#deb-src http://download.tuxfamily.org/3v1debedgyberyl-svn feisty eyecandy