安装应用
我们以安装 kubectl 命令为例：
第一步、先进行应用的搜索
# snap search kubectl
Name Version Publisher Notes Summary
kubectl 1.18.8 canonical✓ classic Command line client for controlling a Kubernetes cluster.
kubernetes-worker 0.0.1 canonical✓ - A complete Kubernetes worker
kafkactl 1.11.0 dwi-di - A command-line interface for interaction with Apache Kafka
kubectl-eks 1.10.3 canonical-cloud-snaps classic kubectl controls the Kubernetes cluster manager.
kubectl-iexec v1.6.2-next leetserve - plugin to interactively exec to a pod
client-keystone-auth v1.14.0+git36.e163280 knobby - Client plugin for kubectl to enable keystone authentication.
devoperator 1.5.1 art-hens-teeth classic DevOps tools
kube-commander 0.2.1 anatoly-rugalev - Browse your kubernetes clusters in a casual way
第二步、查看软件包信息，获取所有可用版本
# snap info kubectl
name: kubectl
summary: Command line client for controlling a Kubernetes cluster.
publisher: Canonical✓
store-url: https://snapcraft.io/kubectl
contact: https://www.ubuntu.com/kubernetes
license: Apache-2.0
description: |
kubectl is a command line client for running commands against Kubernetes
clusters.
For more information about kubectl, including syntax, descriptions of command operations, and
common examples, see the [overview](https://kubernetes.io/docs/reference/kubectl/overview/). For
details about each command, including all the supported flags and subcommands, see the [kubectl
reference
documentation](https://kubernetes.io/docs/reference/generated/kubectl/kubectl-commands/).
snap-id: ZgG2URycDgvxSVskfoZxn44uaRMw0iwe
channels:
latest/stable: 1.18.8 2020-08-27 (1612) 10MB classic
latest/candidate: 1.18.8 2020-08-27 (1612) 10MB classic
latest/beta: 1.18.8 2020-08-27 (1612) 10MB classic
latest/edge: 1.18.8 2020-08-27 (1612) 10MB classic
1.19/stable: 1.19.0 2020-08-27 (1623) 10MB classic
1.19/candidate: 1.19.0 2020-08-27 (1623) 10MB classic
1.19/beta: 1.19.0 2020-08-27 (1623) 10MB classic
1.19/edge: 1.19.0 2020-08-27 (1623) 10MB classic
1.18/stable: 1.18.8 2020-08-26 (1612) 10MB classic
...
第三步、安装应用（或特定版本）
# snap install kubectl --classic
// 如果需要安装特定版本
# snap install kubectl --classic --channel=1.18/stable
注意事项，是否使用 --classic 选项与应用程序权限有关，应用的 Snapcraft 主页或者错误信息会提示是否需要使用 --classic 选项。
相关链接
Installing the Snap Store app
参考文献
K4NZ / 使用 snap 安装应用How to install snap packages behind web proxy on Ubuntu 16.04 - Ask UbuntuHow to list all available versions of a snap which is not installed? - Ask Ubuntuubuntu - Install specific previous version of package using snap? - Unix & Linux Stack Exchange
