nodejs 已经安装好了,可以通过 nodejs --version 输出来判断。

另外,请注意,当我尝试升级节点时,在执行 apt-get 更新时出现以下错误:
sudo apt-get update
.
..
Err:13 http://extras.ubuntu.com/ubuntu xenial/main Sources
404 Not Found [IP: 91.189.92.152 80]
Ign:17 http://extras.ubuntu.com/ubuntu xenial/main amd64 Packages
Ign:20 http://extras.ubuntu.com/ubuntu xenial/main i386 Packages
Ign:22 http://extras.ubuntu.com/ubuntu xenial/main all Packages
Ign:23 http://extras.ubuntu.com/ubuntu xenial/main Translation-en_US
Ign:24 http://extras.ubuntu.com/ubuntu xenial/main Translation-en
Ign:25 http://extras.ubuntu.com/ubuntu xenial/main amd64 DEP-11 Metadata
Ign:26 http://extras.ubuntu.com/ubuntu xenial/main DEP-11 64x64 Icons
Fetched 204 kB in 12s (16.5 kB/s)
Reading package lists... Done
W: The repository 'http://extras.ubuntu.com/ubuntu xenial Release' does not have a Release file.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: Failed to fetch http://extras.ubuntu.com/ubuntu/dists/xenial/main/source/Sources 404 Not Found [IP: 91.189.92.152 80]
E: Some index files failed to download. They have been ignored, or old ones used instead.
不确定问题是什么,但是当我在某处阅读时猜测一些名称冲突 ubuntu 也有一些名为“node”的包,但是需要解决这个问题。
提前致谢。