大家好，
我想在 VMware 的 Ubuntu 21.04 虚拟机中本地安装 Discourse，但遇到了以下错误：
./launcher bootstrap app
cd /pups && git pull && git checkout v1.0.3 && /pups/bin/pups --stdin
fatal: unable to access ‘GitHub - discourse/pups: Simple yaml based bootstrapper for Linux machines · GitHub’: Could not resolve host: github.com
e0146dd79cd1704e68b8c6aab0168f269af67c8eac4880a7c2ed4276e78031f2
** 引导失败 ** 请向上滚动并查找更早的错误消息，可能不止一条。
./discourse-doctor 可能有助于诊断问题。
不过，当我尝试在 /tmp 中克隆时，它却可以正常工作：
/tmp# git clone GitHub - discourse/pups: Simple yaml based bootstrapper for Linux machines · GitHub
Cloning into ‘pups’…
remote: Enumerating objects: 477, done.
remote: Counting objects: 100% (136/136), done.
remote: Compressing objects: 100% (97/97), done.
remote: Total 477 (delta 60), reused 94 (delta 33), pack-reused 341
Receiving objects: 100% (477/477), 83.41 KiB | 1.63 MiB/s, done.
Resolving deltas: 100% (233/233), done.
nslookup 也能正常工作（真令人惊讶 :-)）：
nslookup github.com
Server: 127.0.0.53
Address: 127.0.0.53#53Non-authoritative answer:
Name: github.com
Address: 140.82.121.4
有什么建议吗？
非常感谢大家！