执行命令安装docker引擎moby-engine时，可能由于网络出错，造成与服务器断连，要求重新输入账户名和密码。

再次重新安装引擎，系统提示如下报错。

sudo apt-get install moby-engine
E: Could not get lock /var/lib/dpkg/lock-frontend - open (11: Resource temporarily unavailable)
E: Unable to acquire the dpkg frontend lock (/var/lib/dpkg/lock-frontend), is another process using it?

可能由于进程被占用。首先更新。

sudo apt-get update

sudo rm /var/lib/dpkg/lock-frontend

sudo rm /var/lib/dpkg/lock

再次重新安装，仍然报错。

sudo apt-get install moby-engine
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages were automatically installed and are no longer required:
  linux-azure-5.4-cloud-tools-5.4.0-1059 linux-azure-5.4-cloud-tools-5.4.0-1061 linux-azure-5.4-headers-5.4.0-1059 linux-azure-5.4-headers-5.4.0-1061 linux-azure-5.4-tools-5.4.0-1059 linux-azure-5.4-tools-5.4.0-1061
  linux-cloud-tools-5.4.0-1061-azure linux-headers-5.4.0-1061-azure linux-image-5.4.0-1061-azure linux-modules-5.4.0-1061-azure linux-modules-extra-5.4.0-1061-azure linux-tools-5.4.0-1061-azure
Use 'sudo apt autoremove' to remove them.
The following additional packages will be installed:
  moby-buildx moby-cli moby-containerd moby-runc pigz
Suggested packages:
  aufs-tools cgroupfs-mount | cgroup-lite
E: Could not get lock /var/cache/apt/archives/lock - open (11: Resource temporarily unavailable)
E: Unable to lock directory /var/cache/apt/archives/

这次再删掉相关内容，更新系统，则可顺利安装。

sudo rm -rf /var/cache/apt/archives/lock

sudo apt-get update

参见： 

关于deepin下安装ATOM报错 E: Unable to lock directory /var/cache/apt/archives/_我超级喜欢赵方婧的-CSDN博客