完美解决ubuntu报错：ppa.launchpad与404 Not Found [IP: 91.189.95.85 80]_ppa:cloud-installer not found

报错描述：

解决方法：cd /etc/apt/sources.list.d
注释掉gedit /etc/apt/sources.list该路径下的内容：

#deb http://apt.tvheadend.org/stable xenial main
#deb-src http://apt.tvheadend.org/stable xenial main
#deb http://ppa.launchpad.net/v-launchpad-jochen-sprickerhof-de/pcl/ubuntu maverick main
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再次进去list.d目录下

 ls
bazel.list                                nvidia-ml.list
bazel.list.save                           nvidia-ml.list.save
boost-latest-ubuntu-ppa-xenial.list       ubuntu-toolchain-r-ubuntu-test-xenial.list
boost-latest-ubuntu-ppa-xenial.list.save  ubuntu-toolchain-r-ubuntu-test-xenial.list.save
cuda.list                                 v-launchpad-jochen-sprickerhof-de-ubuntu-pcl-xenial.list
cuda.list.save                            v-launchpad-jochen-sprickerhof-de-ubuntu-pcl-xenial.list.save
deadsnakes-ubuntu-ppa-xenial.list
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修改名字或删除上述报错的指定文件：

mv boost-latest-ubuntu-ppa-xenial.list ./boost1 && mv boost-latest-ubuntu-ppa-xenial.list.save  boost2.save
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再次更新还是不行，再次修改名字防止加载到：

root@ovo:/etc/apt/sources.list.d# mv boost1 teste.boost1
root@ovo:/etc/apt/sources.list.d# mv boost2.save teste.boost2
root@ovo:/etc/apt/sources.list.d# ls
bazel.list                         teste.boost1
bazel.list.save                    teste.boost2
cuda.list                          ubuntu-toolchain-r-ubuntu-test-xenial.list
cuda.list.save                     ubuntu-toolchain-r-ubuntu-test-xenial.list.save
deadsnakes-ubuntu-ppa-xenial.list  v-launchpad-jochen-sprickerhof-de-ubuntu-pcl-xenial.list
nvidia-ml.list                     v-launchpad-jochen-sprickerhof-de-ubuntu-pcl-xenial.list.save
nvidia-ml.list.save
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再次更新还是不行，为了保证删掉带来的风险，现在将它一点到其他路径：

mv teste.boost2 /root/ && mv teste.boost1 /root
root@ovo:/etc/apt/sources.list.d# sl
bash: sl: command not found
root@ovo:/etc/apt/sources.list.d# ls
bazel.list       deadsnakes-ubuntu-ppa-xenial.list           ubuntu-toolchain-r-ubuntu-test-xenial.list.save
bazel.list.save  nvidia-ml.list                              v-launchpad-jochen-sprickerhof-de-ubuntu-pcl-xenial.list
cuda.list        nvidia-ml.list.save                         v-launchpad-jochen-sprickerhof-de-ubuntu-pcl-xenial.list.save
cuda.list.save   ubuntu-toolchain-r-ubuntu-test-xenial.list
root@ovo:/etc/apt/sources.list.d# mv teste.boost2 /root/ && mv teste.boost1 /root
mv: cannot stat 'teste.boost2': No such file or directory
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再次更新类似的再把相应的文件移动到其他路径：

Err:14 http://ppa.launchpad.net/v-launchpad-jochen-sprickerhof-de/pcl/ubuntu xenial Release
  404  Not Found [IP: 91.189.95.85 80]
Reading package lists... Done
E: The repository 'http://ppa.launchpad.net/v-launchpad-jochen-sprickerhof-de/pcl/ubuntu xenial Release' does not have a Release file.
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移动后：

/etc/apt/sources.list.d# mv v-launchpad-jochen-sprickerhof-de-ubuntu-pcl-xenial.list /root && mv v-launchpad-jochen-sprickerhof-de-ubuntu-pcl-xenial.list.save /root
root@ovo:/etc/apt/sources.list.d# ls
bazel.list       cuda.list.save                     nvidia-ml.list.save
bazel.list.save  deadsnakes-ubuntu-ppa-xenial.list  ubuntu-toolchain-r-ubuntu-test-xenial.list
cuda.list        nvidia-ml.list                     ubuntu-toolchain-r-ubuntu-test-xenial.list.save
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再次更新：

/etc/apt/sources.list.d# apt update
Hit:1 http://storage.googleapis.com/bazel-apt stable InRelease
Ign:2 https://developer.download.nvidia.com/compute/cuda/repos/ubuntu1604/x86_64  InRelease
Ign:3 https://developer.download.nvidia.com/compute/machine-learning/repos/ubuntu1604/x86_64  InRelease
Hit:4 https://developer.download.nvidia.com/compute/cuda/repos/ubuntu1604/x86_64  Release
Hit:6 https://developer.download.nvidia.com/compute/machine-learning/repos/ubuntu1604/x86_64  Release
Hit:8 http://mirrors.aliyun.com/ubuntu xenial InRelease                
Hit:9 http://mirrors.aliyun.com/ubuntu xenial-updates InRelease                                                                 
Hit:10 http://mirrors.aliyun.com/ubuntu xenial-security InRelease                                                               
Hit:11 http://ppa.launchpad.net/deadsnakes/ppa/ubuntu xenial InRelease                              
Hit:12 http://ppa.launchpad.net/ubuntu-toolchain-r/test/ubuntu xenial InRelease
Reading package lists... Done                      
Building dependency tree       
Reading state information... Done
166 packages can be upgraded. Run 'apt list --upgradable' to see them.
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完美解决。