ubuntu报错： - RemoveCaches (13: Permission denied)

完整报错内容显示如下：

Reading package lists... Done
E: Could not open lock file /var/lib/apt/lists/lock - open (13: Permission denied)
E: Unable to lock directory /var/lib/apt/lists/
W: Problem unlinking the file /var/cache/apt/pkgcache.bin - RemoveCaches (13: Permission denied)
W: Problem unlinking the file /var/cache/apt/srcpkgcache.bin - RemoveCaches (13: Permission denied)

报错原因

权限不够，切换到root账户下。
执行修改root密码的命令：sudo passwd root

密码修改成功之后，执行命令：su

输入刚才修改的密码，再执行原来要执行的指令即可。