multipass 切换成 lxd 后端之后，创建新的 vm时报错
multipass launch -m 4G -n master --bridged
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launch failed: Cannot connect to /var/snap/lxd/common/lxd/unix.socket: QLocalSocket::connectToServer: Invalid name
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解决问题路径
systemctl status snap.multipass.multipassd.service
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snap.multipass.multipassd.service - Service for snap application multipass.multipassd
Loaded: loaded (/etc/systemd/system/snap.multipass.multipassd.service; enabled; vendor preset: enabled)
Active: active (running) since Wed 2022-04-27 10:21:42 CST; 4min 20s ago
Main PID: 995 (multipassd)
Tasks: 11 (limit: 38329)
Memory: 89.9M
CPU: 1.926s
CGroup: /system.slice/snap.multipass.multipassd.service
└─995 /snap/multipass/6904/bin/multipassd --verbosity debug --logger platform
4月 27 10:21:44 jeffse-pc multipassd[995]: Could not update manifest: failed to download from 'https://cdimage.ubuntu.com/ubuntu-core/16/stable/current/ubuntu-core-16-amd64.img.xz': Hos>
4月 27 10:21:44 jeffse-pc multipassd[995]: Cannot retrieve headers for https://cloud-images.ubuntu.com/buildd/releases/bionic/release/bionic-server-cloudimg-amd64-disk.img: Host cloud-i>
4月 27 10:21:44 jeffse-pc multipassd[995]: Could not update manifest: failed to download from 'https://cloud-images.ubuntu.com/buildd/releases/bionic/release/bionic-server-cloudimg-amd6>
4月 27 10:21:44 jeffse-pc multipassd[995]: Error getting https://codeload.github.com/canonical/multipass-workflows/zip/refs/heads/main: Host codeload.github.com not found - trying cache.
4月 27 10:21:44 jeffse-pc multipassd[995]: gRPC listening on unix:/var/snap/multipass/common/multipass_socket, SSL:on
4月 27 10:21:44 jeffse-pc multipassd[995]: Cannot connect to /var/snap/lxd/common/lxd/unix.socket: QLocalSocket::connectToServer: Invalid name
4月 27 10:21:44 jeffse-pc multipassd[995]: Starting Multipass 1.8.0
4月 27 10:21:44 jeffse-pc multipassd[995]: Daemon arguments: /snap/multipass/6904/bin/multipassd --verbosity debug --logger platform
4月 27 10:23:15 jeffse-pc multipassd[995]: Cannot retrieve headers for https://cloud-images.ubuntu.com/buildd/releases/focal/release/focal-server-cloudimg-amd64-disk.img: Network timeout
4月 27 10:23:15 jeffse-pc multipassd[995]: Could not update manifest: failed to download from 'https://cloud-images.ubuntu.com/buildd/releases/focal/release/focal-server-cloudimg-amd64->
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问题分析
#看日志镜像下载不下来导致的问题，原因是镜像的地址有问题
https://cdimage.ubuntu.com/ubuntu-core/16/stable/current/ubuntu-core-16-amd64.img.xz':
https://cloud-images.ubuntu.com/buildd/releases/bionic/release/bionic-server-cloudimg-amd64-disk.img:
多了 ': 和 :
# 实际上不是，是因为没有安装 lxd
sudo snap install lxd
再重新启动宿主机，问题解决
可以参考我写的这篇： https://www.jianshu.com/p/560d63615318
