apt-get 抓不到bison - Linux

※ 引述《MaxHaru (懂得放手..才是王道)》之銘言：
: 我執行sudo apt-get install bison
: 系統會出現如下的訊息
: 讀取套件清單中... 完成
: 了解套件依存關係中
: reading state information... 完成
: 現在沒有可用的套件 bison,但是它被其它的套件引用了。
: 這可能意味著這個套件已經消失或捨棄,
: 或者只能在其他原碼中找到
: E: 套件bison 還沒有可供安裝的候選版本
: 請問各位高手,我該怎麼解決我的問題
: 因為作業的關係,所以必須要能安裝bison 和 flex等套件
: 在此先謝謝....<(_ _)>
: PS:我是在VirtualBox下跑ubuntu 7.1版

sources.list內容

deb cdrom:[Ubuntu 7.10 _Gutsy Gibbon_ - Release i386 (20071016)]/ 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://tw.archive.ubuntu.com/ubuntu/ gutsy main restricted
# Line commented out by installer because it failed to verify:
#deb-src http://tw.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://tw.archive.ubuntu.com/ubuntu/ gutsy-updates main restricted
# Line commented out by installer because it failed to verify:
#deb-src http://tw.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://tw.archive.ubuntu.com/ubuntu/ gutsy universe
# Line commented out by installer because it failed to verify:
#deb-src http://tw.archive.ubuntu.com/ubuntu/ gutsy universe
# Line commented out by installer because it failed to verify:
#deb http://tw.archive.ubuntu.com/ubuntu/ gutsy-updates universe
# Line commented out by installer because it failed to verify:
#deb-src http://tw.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://tw.archive.ubuntu.com/ubuntu/ gutsy multiverse
# Line commented out by installer because it failed to verify:
#deb-src http://tw.archive.ubuntu.com/ubuntu/ gutsy multiverse
# Line commented out by installer because it failed to verify:
#deb http://tw.archive.ubuntu.com/ubuntu/ gutsy-updates multiverse
# Line commented out by installer because it failed to verify:
#deb-src http://tw.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://tw.archive.ubuntu.com/ubuntu/ gutsy-backports main restricted
universe multiverse
# deb-src http://tw.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


請問我該怎麼去更新我的需要套件呢??

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