我放弃了双启动系统，因为它只会带来麻烦。现在我的笔记本电脑上只安装了 Ubuntu 17.10。不知怎的，我最近似乎很不走运。笔记本电脑找不到 Ubuntu 的启动分区。我可以正常启动到 Live USB。
我没有 UEFI。Ubuntu 硬盘管理器说我的硬盘可能很快就会出现故障。所以，要么是光盘坏了，要么是引导加载程序出了问题。希望有人能帮忙。
ubuntu@ubuntu:~$ sudo fdisk -l
Disk /dev/loop0: 1.3 GiB, 1425731584 bytes, 2784632 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk /dev/sda: 232.9 GiB, 250059350016 bytes, 488397168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x856f268a
Device Boot Start End Sectors Size Id Type
/dev/sda1 * 2048 117186559 117184512 55.9G 83 Linux
/dev/sda2 117188606 488396799 371208194 177G 5 Extended
/dev/sda5 132812800 488396799 355584000 169.6G 83 Linux
/dev/sda6 117188608 132812799 15624192 7.5G 82 Linux swap / Solaris
Partition table entries are not in disk order.