安裝后的默認source

# deb cdrom:[Ubuntu 19.10 _Eoan Ermine_ - Release amd64 (20191017)]/ eoan main restricted# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to # newer versions of the distribution. deb http://cn.archive.ubuntu.com/ubuntu/ eoan main restricted # deb-src http://cn.archive.ubuntu.com/ubuntu/ eoan main restricted## Major bug fix updates produced after the final release of the ## distribution. deb http://cn.archive.ubuntu.com/ubuntu/ eoan-updates main restricted # deb-src http://cn.archive.ubuntu.com/ubuntu/ eoan-updates main restricted## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu ## team. Also, please note that software in universe WILL NOT receive any ## review or updates from the Ubuntu security team. deb http://cn.archive.ubuntu.com/ubuntu/ eoan universe # deb-src http://cn.archive.ubuntu.com/ubuntu/ eoan universe deb http://cn.archive.ubuntu.com/ubuntu/ eoan-updates universe # deb-src http://cn.archive.ubuntu.com/ubuntu/ eoan-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. deb http://cn.archive.ubuntu.com/ubuntu/ eoan multiverse # deb-src http://cn.archive.ubuntu.com/ubuntu/ eoan multiverse deb http://cn.archive.ubuntu.com/ubuntu/ eoan-updates multiverse # deb-src http://cn.archive.ubuntu.com/ubuntu/ eoan-updates multiverse## 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://cn.archive.ubuntu.com/ubuntu/ eoan-backports main restricted universe multiverse # deb-src http://cn.archive.ubuntu.com/ubuntu/ eoan-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 eoan partner # deb-src http://archive.canonical.com/ubuntu eoan partnerdeb http://security.ubuntu.com/ubuntu eoan-security main restricted # deb-src http://security.ubuntu.com/ubuntu eoan-security main restricted deb http://security.ubuntu.com/ubuntu eoan-security universe # deb-src http://security.ubuntu.com/ubuntu eoan-security universe deb http://security.ubuntu.com/ubuntu eoan-security multiverse # deb-src http://security.ubuntu.com/ubuntu eoan-security multiverse# This system was installed using small removable media # (e.g. netinst, live or single CD). The matching "deb cdrom" # entries were disabled at the end of the installation process. # For information about how to configure apt package sources, # see the sources.list(5) manual.

修改為:

deb http://mirrors.aliyun.com/ubuntu/ eoan main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ eoan main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ eoan-security main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ eoan-security main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ eoan-updates main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ eoan-updates main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ eoan-backports main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ eoan-backports main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ eoan-proposed main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ eoan-proposed main restricted universe multiverse

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總結

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