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请教各位老师，我在Ubuntu18.04LTS下，安装Openfoam6。就按照官网中的教程一步步地安装。安装到图1中所示的第3步时 出现了图2中的报错。 请教各位老师，该如何解决
网络问题，重新执行sudo apt-get update 试试
出现了图2中的报错。
请教各位老师，该如何解决