apt upgrade 做的是最保守的升级

原创于 2019-03-11 10:09:00 发布 · 679 阅读

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本文详细解析了Ubuntu系统中APT包管理器的升级机制。重点介绍了'upgrade'命令的功能，它能安全地升级现有系统而不安装新包或移除已有包，避免可能的依赖冲突。对于无法升级的包，如CMake3.8和gcc-8，文章建议使用'dselect'或'apt-get install'命令进行强制安装。

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参见：Ubuntu APT 用户手册

内容：

Upgrade will attempt to gently upgrade the whole system. Upgrade will never install a new package or remove an existing package, nor will it ever upgrade a package that might cause some other package to break. This can be used daily to relatively safely upgrade the system. Upgrade will list all of the packages that it could not upgrade, this usually means that they depend on new packages or conflict with some other package. dselect orapt-get install can be used to force these packages to install.

所以，如果需要升级某个包的版本，比如装CMake3.8，gcc-8等，需要手工处理。