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91.
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There are thousands of programs available to install on Ubuntu. These programs are stored in software repositories and are made freely available for all Ubuntu users. This makes it very easy to install new programs, and it is also very secure because each program you install is built specially for Ubuntu and checked before it is allowed into the repositories.
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Ubuntu 可以安裝上千種程式，這些程式被儲存在軟體套件庫中，免費提供給任何需要的 Ubuntu 使用者。這使得軟體安裝變得很容易，而且非常的安全，因為任何您安裝的軟體在進入套件庫前，都經過 Ubuntu 的精密檢驗。
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Translated and reviewed by
Cheng-Chia Tseng
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Located in
add-applications/C/add-applications.xml:447(para)
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92.
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Software repositories
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軟體套件庫
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Translated and reviewed by
Cheng-Chia Tseng
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Located in
add-applications/C/add-applications.xml:456(title)
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93.
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To organize the software, Ubuntu repositories are categorized into four groups: <emphasis>Main</emphasis>, <emphasis>Restricted</emphasis>, <emphasis>Universe</emphasis>, and <emphasis>Multiverse</emphasis>. The rationale used to determine which software goes into which category is based on the level of support that software development teams provide for a program and the level of compliance the program has to the <ulink url="http://www.ubuntu.com/ubuntu/philosophy">Free Software Philosophy</ulink>.
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Ubuntu 的套件庫將軟體整理為下列四種分類：<emphasis>Main (主要)</emphasis>、<emphasis>Restricted (受限制)</emphasis>、<emphasis>Universe (宇宙)</emphasis>、<emphasis>Multiverse (平行宇宙)</emphasis>。決定軟體分類的準則主要是依據其開發團隊的支援程度與該程式對於<ulink url="http://www.ubuntu.com/ubuntu/philosophy">自由軟體理念</ulink>的遵循程度而定。Ubuntu 把自由軟體和非自由軟體拆開來放；Main 與 Universe 屬自由，Restricted 和 Multiverse 屬非自由，而 Main 與 Restricted 由官方正式支援，至於 Universe 和 Multiverse 則是由社群所維護。
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Translated and reviewed by
Walter Cheuk
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Located in
add-applications/C/add-applications.xml:457(para)
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94.
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The standard Ubuntu Install CD contains some software from the <emphasis>Main</emphasis> and <emphasis>Restricted</emphasis> categories.
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標準的 Ubuntu 安裝光碟包含了 <emphasis>Main</emphasis> 和 <emphasis>Restricted</emphasis> 這兩大類。
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Translated and reviewed by
Jose Sun
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Located in
add-applications/C/add-applications.xml:466(para)
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95.
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If your system is connected to the Internet, many more software programs are made available for installation. For example, the <quote>Universe</quote> and <quote>Multiverse</quote> repositories are only available over the Internet.
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當您的系統接上網際網路之後，將會有更多更多的軟體可以安裝。舉例來說， <quote>Universe</quote> 和 <quote>Multiverse</quote> 軟體庫只在網路上提供。
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Translated and reviewed by
Jose Sun
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Located in
add-applications/C/add-applications.xml:470(para)
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96.
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The <emphasis>Multiverse</emphasis> repository contains software which has been classified as <emphasis>non-free</emphasis>. This software may not be permitted in some jurisdictions. When installing each package from this repository, you should verify that the laws of your country permit you to use it. Also, this software may not include security updates.
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<emphasis>Multiverse</emphasis> 套件庫包含被分類為 <emphasis>non-free (非自由)</emphasis> 的軟體。其中一些軟體並不被某些地區法律所許可。所以當您從該套件庫安裝這類套件時，您應該要確認您所屬國家是否可以使用它們。此外，這類軟體可能沒有安全性更新可以使用。
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Translated by
Cheng-Chia Tseng
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Reviewed by
Pin-hsien Lee
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Located in
add-applications/C/add-applications.xml:477(para)
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97.
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Update repositories
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更新套件庫
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Translated by
Feistybird
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Reviewed by
Feistybird
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Located in
add-applications/C/add-applications.xml:489(title)
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98.
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The Update Manager automatically finds software updates for your computer when they are available. It regularly gathers information on potential updates from a number of online update sources.
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當有套件庫的有任何更新時，「更新管理員」會自動為你的電腦搜尋適合的軟體更新，它會從線上的數個更新來源蒐集潛在的可更新資訊。
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Translated and reviewed by
Cheng-Chia Tseng
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Located in
add-applications/C/add-applications.xml:490(para)
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99.
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If you click <menuchoice><guimenu>System</guimenu><guimenuitem>Administration</guimenuitem><guimenuitem>Software Sources</guimenuitem></menuchoice> and select the <guilabel>Updates</guilabel> tab, you will notice that four update sources are available. An explanation for each of these is provided below:
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如果您按下<menuchoice><guimenu>系統</guimenu><guimenuitem>管理</guimenuitem><guimenuitem>軟體來源</guimenuitem></menuchoice> 並選擇 <guilabel>更新</guilabel> 分頁，您將發現有四種主要的 Ubuntu 更新來源可用，以下為簡介：
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Translated and reviewed by
Cheng-Chia Tseng
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Located in
add-applications/C/add-applications.xml:495(para)
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100.
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<emphasis role="strong">Important security updates:</emphasis> Updates which fix critical security flaws are made available through this source. It is recommended that all users leave this source enabled (it should be enabled by default).
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<emphasis role="strong">重要的安全更新：</emphasis>專門為嚴重的安全漏洞提供修補與更新，建議所有的使用者啟用此來源 (預設情況下應已啟用)。
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Translated and reviewed by
Cheng-Chia Tseng
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Located in
add-applications/C/add-applications.xml:502(para)
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