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使用U盘安装ubuntu18之前systemback备份的镜像时，出现问题：创建还原点已中止，进行的过程当中文件系统发生了严重变化。The restore point creation is aborted!There has been critical changes in the file system during this operation。使用 systemback-sustart 来发现具体错误 ：/.systembacklivepoint/snap/core18/2128复制失.

bluez交叉编译到Arm后，按照hciconfig hci0 uphciconfig hci0 iscan启动蓝牙后，想进行SPP通讯，结果一直找不到channel。问题：执行 sdptool add --channel=1 SP增加频道后，运行sdptool browse local发现出现异常：Failed to connect to SDP server on FF:FF:FF:00:00:00: No such file or directory。解决：在网上查了看有说是bluez版本