Ubuntu执行sudo apt-get update报错E: Failed to fetch https://mirrors.aliyun.com/docker-ce/linux/ubuntu/dists/xenial/InRelease Unable to find expected entry ‘stable/source/Sources’ in Release file (Wrong sources.list entry or malformed file)
报错内容：
E: Failed to fetch https://mirrors.aliyun.com/docker-ce/linux/ubuntu/dists/xenial/InRelease Unable to find expected entry 'stable/source/Sources' in Release file (Wrong sources.list entry or malformed file)
W: Failed to fetch https://pkg.jenkins.io/debian-stable/binary/InRelease Could not resolve host: pkg.jenkins.io
W: Some index files failed to download. They have been ignored, or old ones used instead.
报错原因：
# 这个错误可能是由于源列表文件（/etc/apt/sources.list）中的条目不正确或文件格式不正确。
# 可以尝试使用以下命令备份源列表文件并创建一个新的源列表文件：
解决办法：
sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak
sudo nano /etc/apt/sources.list
# 在编辑器中打开源列表文件后，将内容替换为以下内容（适用于 Ubuntu 16.04，根据版本自查源地址）：
# 阿里云镜像源：
deb http://mirrors.aliyun.com/ubuntu/ xenial main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ xenial-security main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ xenial-updates main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ xenial-backports main restricted universe multiverse
deb [arch=amd64] https://download.docker.com/linux/ubuntu xenial stable
deb https://pkg.jenkins.io/debian-stable binary/
# 清华大学镜像源：
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-updates main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-backports main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-security main restricted universe multiverse
deb [arch=amd64] https://download.docker.com/linux/ubuntu xenial stable
deb https://pkg.jenkins.io/debian-stable binary/
# 将其中之一添加到 `/etc/apt/sources.list` 文件中，
# 保存后运行 `sudo apt-get clean' 'sudo apt-get update` 命令，应该可以成功更新索引文件
sudo apt-get clean
sudo apt-get update
补充：文章来源：https://www.toymoban.com/news/detail-761134.html
如果还是没有办法解决问题，请按照下面步骤操作一遍文章来源地址https://www.toymoban.com/news/detail-761134.html
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"
sudo apt-get clean
sudo apt-get update
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