ubunto查看tree時The program 'tree' is currently not installed. You can install it by typing: sudo apt i

執行tree時候出現如下錯誤： 一般apt-get出現這種情況： Reading package lists… Done Building dependency tree Reading state information… Done E: Unable to locate package **** 是沒有更新APT庫 執行如下代碼更新一下就好了： udo apt-get update sudo

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