Ubuntu安装某些程序时会出现这样几种情况
1 "E: dpkg was interrupted, you must manually run 'dpkg --configure -a' to correct the problem."，意思是要你手动安装命令，可输入dpkg --configure -a，然后再apt update -y。
2 出现“dpkg: error processing package mongodb-org (--configure)”，
3 W: Some index files failed to download. They have been ignored, or old ones used instead.
有的说可以修改dns解决，在vi /etc/resolv.conf添加： nameserver 8.8.8.8
4 umount .gvfs：must be superuser to unmout，意思是umount .gvfs：必须是超级用户才能卸载。
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