Please install all available updates for your release before upgrading

Vivant

在Ubuntu从18.04升级到20.04的时候，输入：

1. do-release-upgrade

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出现如下提示：

1. Please install all available updates for your release before upgrading.

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通过手动方式安装更新：

1. sudo apt update
   
2. sudo apt upgrade
   
3. sudo apt dist-upgrade
   
4. sudo do-release-upgrade

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