升级需要磁盘'/'上更多的可用空间

我想通过18.04从16.04升级到20.04。但是,当我尝试更新到18.04时,我得到:

The upgrade has aborted. The upgrade needs a total of 5.754 M free space on disk '/'. 
Please free at least an additional 3.059 M of disk space on '/'.

鉴于(我想)以后我将需要更多空间升级到20.04,什么是最好的处理方式?

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