Ubuntu 更新源中的是 Go 1.18（apt install golang），现在 Go 1.20 出来了，我想尝尝鲜，就需要考虑多版本共存的方案了。
Python 有 pyenv，Node 有 nvm。
Go 也有一些社区项目，比如 syndbg/goenv 
其中 gvm 之前有尝试过，参考：gvm: Golang 版本管理
本文是介绍官方的 dl，可以说是非常简单。
go install golang.org/dl/go1.20@latest
~/go/bin/go1.20 download
Downloaded 0.0% ( 16384 / 99869470 bytes) ...
Downloaded 3.5% ( 3522544 / 99869470 bytes) ...
Downloaded 9.8% ( 9748480 / 99869470 bytes) ...
Downloaded 15.7% (15712240 / 99869470 bytes) ...
Downloaded 21.7% (21626880 / 99869470 bytes) ...
Downloaded 27.6% (27541296 / 99869470 bytes) ...
Downloaded 32.9% (32866288 / 99869470 bytes) ...
Downloaded 38.9% (38846464 / 99869470 bytes) ...
Downloaded 44.9% (44793840 / 99869470 bytes) ...
Downloaded 50.8% (50741248 / 99869470 bytes) ...
Downloaded 56.7% (56672240 / 99869470 bytes) ...
Downloaded 62.7% (62586864 / 99869470 bytes) ...
Downloaded 68.1% (67993600 / 99869470 bytes) ...
Downloaded 74.0% (73924304 / 99869470 bytes) ...
Downloaded 79.9% (79839200 / 99869470 bytes) ...
Downloaded 85.9% (85753856 / 99869470 bytes) ...
Downloaded 91.8% (91717424 / 99869470 bytes) ...
Downloaded 97.2% (97025728 / 99869470 bytes) ...
Downloaded 100.0% (99869470 / 99869470 bytes)
Unpacking /home/catroll/sdk/go1.20/go1.20.linux-amd64.tar.gz ...
Success. You may now run 'go1.20'
~/go/bin/go1.20 download
go1.20: already downloaded in /home/catroll/sdk/go1.20
~/sdk/go1.20/bin/go version
go version go1.20 linux/amd64
# sudo ln -sf ~/sdk/go1.20/bin/go /usr/local/bin/go
ln -sf ~/sdk/go1.20/bin/go ~/.local/bin/go1.20
ln -sf go1.20 ~/.local/bin/go
