安装完成后，我再次启动 USB 并执行了以下常规步骤：
sudo add-apt-repository ppa:yannubuntu/boot-repair
sudo sh -c "sed -i 's/trusty/saucy/g' /etc/apt/sources.list.d/yannubuntu-boot-repair-trusty.list"
sudo apt-get update
sudo apt-get install -y boot-repair && boot-repair
前 3 个步骤后我没有收到任何错误消息。然而在最后一步我得到了输出：
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package boot-repair
这里有很多类似这样的问题。然而解决方案似乎总是我已经使用的 4 个步骤。请帮忙
编辑：这是第二次执行 4 个步骤的完整输出：
ubuntu@ubuntu:~$ sudo add-apt-repository ppa:yannubuntu/boot-repair
Simple tool to repair frequent boot problems.
Website: https://sourceforge.net/p/boot-repair/home
More info: https://launchpad.net/~yannubuntu/+archive/ubuntu/boot-repair
Press [ENTER] to continue or ctrl-c to cancel adding it
gpg: keyring `/tmp/tmpou5r8p95/secring.gpg' created
gpg: keyring `/tmp/tmpou5r8p95/pubring.gpg' created
gpg: requesting key 60D8DA0B from hkp server keyserver.ubuntu.com
gpg: /tmp/tmpou5r8p95/trustdb.gpg: trustdb created
gpg: key 60D8DA0B: public key "Launchpad PPA for YannUbuntu" imported
gpg: Total number processed: 1
gpg: imported: 1 (RSA: 1)
OK
ubuntu@ubuntu:~$ sudo sh -c "sed -i 's/trusty/saucy/g' /etc/apt/sources.list.d/yannubuntu-boot-repair-trusty.list"
ubuntu@ubuntu:~$ sudo apt-get update
Ign cdrom://Ubuntu 14.04.3 LTS _Trusty Tahr_ - Beta amd64 (20150805) trusty InRelease
Ign cdrom://Ubuntu 14.04.3 LTS _Trusty Tahr_ - Beta amd64 (20150805) vivid InRelease
Ign cdrom://Ubuntu 14.04.3 LTS _Trusty Tahr_ - Beta amd64 (20150805) trusty/main Translation-en_US
Ign cdrom://Ubuntu 14.04.3 LTS _Trusty Tahr_ - Beta amd64 (20150805) trusty/main Translation-en
Ign cdrom://Ubuntu 14.04.3 LTS _Trusty Tahr_ - Beta amd64 (20150805) trusty/restricted Translation-en_US
Ign cdrom://Ubuntu 14.04.3 LTS _Trusty Tahr_ - Beta amd64 (20150805) trusty/restricted Translation-en
Ign cdrom://Ubuntu 14.04.3 LTS _Trusty Tahr_ - Beta amd64 (20150805) vivid/main Translation-en_US
Ign cdrom://Ubuntu 14.04.3 LTS _Trusty Tahr_ - Beta amd64 (20150805) vivid/main Translation-en
Ign cdrom://Ubuntu 14.04.3 LTS _Trusty Tahr_ - Beta amd64 (20150805) vivid/restricted Translation-en_US
Ign cdrom://Ubuntu 14.04.3 LTS _Trusty Tahr_ - Beta amd64 (20150805) vivid/restricted Translation-en
Ign http://ppa.launchpad.net saucy InRelease
Ign http://archive.ubuntu.com trusty InRelease
Hit http://ppa.launchpad.net saucy Release.gpg
Ign http://archive.ubuntu.com trusty-updates InRelease
Hit http://ppa.launchpad.net saucy Release
Hit http://archive.ubuntu.com trusty Release.gpg
Hit http://ppa.launchpad.net saucy/main amd64 Packages
Hit http://archive.ubuntu.com trusty-updates Release.gpg
Hit http://ppa.launchpad.net saucy/main Translation-en
Hit http://archive.ubuntu.com trusty Release
Ign http://security.ubuntu.com trusty-security InRelease
Hit http://archive.ubuntu.com trusty-updates Release
Hit http://archive.ubuntu.com trusty/main amd64 Packages
Hit http://archive.ubuntu.com trusty/restricted amd64 Packages
Hit http://security.ubuntu.com trusty-security Release.gpg
Hit http://archive.ubuntu.com trusty/main Translation-en
Hit http://security.ubuntu.com trusty-security Release
Hit http://archive.ubuntu.com trusty/restricted Translation-en
Hit http://archive.ubuntu.com trusty-updates/main amd64 Packages
Hit http://archive.ubuntu.com trusty-updates/restricted amd64 Packages
Hit http://security.ubuntu.com trusty-security/main amd64 Packages
Hit http://archive.ubuntu.com trusty-updates/main Translation-en
Hit http://archive.ubuntu.com trusty-updates/restricted Translation-en
Hit http://security.ubuntu.com trusty-security/restricted amd64 Packages
Hit http://security.ubuntu.com trusty-security/main Translation-en
Hit http://security.ubuntu.com trusty-security/restricted Translation-en
Ign http://archive.ubuntu.com trusty/main Translation-en_US
Ign http://archive.ubuntu.com trusty/restricted Translation-en_US
Reading package lists... Done
W: Duplicate sources.list entry http://ppa.launchpad.net/yannubuntu/boot-repair/ubuntu/ saucy/main amd64 Packages (/var/lib/apt/lists/ppa.launchpad.net_yannubuntu_boot-repair_ubuntu_dists_saucy_main_binary-amd64_Packages)
W: Duplicate sources.list entry http://ppa.launchpad.net/yannubuntu/boot-repair/ubuntu/ saucy/main amd64 Packages (/var/lib/apt/lists/ppa.launchpad.net_yannubuntu_boot-repair_ubuntu_dists_saucy_main_binary-amd64_Packages)
W: You may want to run apt-get update to correct these problems
ubuntu@ubuntu:~$ sudo apt-get install -y boot-repair && boot-repair
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package boot-repair
答案1
似乎存储库中没有适用于 saucy 版本的软件包。也许您可以尝试安装适用于 trusty 版本的软件包（即省略第二条命令
sudo sh -c "sed -i 's/trusty/saucy/g' /etc/apt/sources.list.d/yannubuntu-boot-repair-trusty.list"
）