我的笔记本从15.04升级到15.10,接着想把台式机的直接重装到15.10,所以下载了15.10 64bit的iso，利用笔记本的15.10系统里面的启动盘制作器安装了u盘的livecd（15.10），制作完成后利用启动盘制作器的测试磁盘功能试了一下，启动不了，以为是下载的iso有问题，试过重新下载和下载麒麟15.10,都是一样的情形。如果安装15.04就没有问题，难道要先安装15.04,再升级？？

1. 需要先檢查 md5sum 碼
2. 無論你使用什麼工具燒錄成 Live USB 都需要先檢查燒錄有沒有缺損
通過 1,2 才能放心使用來安裝或試用

3. https://wiki.ubuntu.com/WilyWerewolf/Re ... st-install
Due to changes in syslinux, it is not currently possible to
由於 syslinux 套件版本之間的不一致 影響 自 14.10 到 15.10 這個 启动盘制作器 或 其它燒錄軟體 燒錄出來的 Live USB 經常存在問題 網路上討論許多
3-1. 目前推薦燒錄 Live USB 的方法 是
3-1-1. 在 Ubuntu 使用 mkusb
https://help.ubuntu.com/community/mkusb
3-1-2. 在 Windows 使用 Win32DiskImager
https://wiki.ubuntu.com/Win32DiskImager/iso2usb
https://wiki.ubuntu.com/Win32DiskImager ... FormatHelp
3-1-3. 燒錄出來的 Live USB 可以在 UEFI 開機 也可以在 Legacy Bios 開機
3-1-3-1. 所以使用 fdisk 等等 Ubuntu 的磁盤工具 可能無法完全辨識其格式
3-1-4. 因此 所燒錄出來的 Live USB 如果要重新利用 參見
https://help.ubuntu.com/community/mkusb ... ole_device
Wipe the first megabyte or the whole device

md5sum是对的，但是使用mkusb的时候，总是提示usb设备is busy： in fstab....

是不是 U 盤掛載中 ?
需要 卸載
把下面指令 複製 貼進終端機 執行
1. df -h
2. sudo fdisk -l
把結果直接 選取/複製 貼上來

注意 15.10 請參閱
3. https://help.ubuntu.com/community/mkusb ... 4.04.1_LTS
This method applies to newer versions too: 14.04.2, 14.04.3, 15.04, 15.10.
3-1. https://help.ubuntu.com/community/mkusb ... tu-14.04.1

我把u盘sdb umount了还是不行，结果如下：

df -h
文件系统 容量 已用 可用 已用% 挂载点
udev 3.8G 0 3.8G 0% /dev
tmpfs 769M 12M 757M 2% /run
/dev/sda7 47G 12G 34G 26% /
tmpfs 3.8G 26M 3.8G 1% /dev/shm
tmpfs 5.0M 4.0K 5.0M 1% /run/lock
tmpfs 3.8G 0 3.8G 0% /sys/fs/cgroup
/dev/sda8 47G 18G 27G 40% /home
/dev/sda6 151G 91G 60G 61% /media/wickytam/work
/dev/sda5 100G 55G 46G 55% /media/wickytam/Tools
tmpfs 769M 76K 769M 1% /run/user/1000
/dev/sda1 1.5G 588M 913M 40% /media/wickytam/SYSTEM_DRV


sudo fdisk -l
Disk /dev/ram0: 64 MiB, 67108864 bytes, 131072 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes


Disk /dev/ram1: 64 MiB, 67108864 bytes, 131072 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes


Disk /dev/ram2: 64 MiB, 67108864 bytes, 131072 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes


Disk /dev/ram3: 64 MiB, 67108864 bytes, 131072 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes


Disk /dev/ram4: 64 MiB, 67108864 bytes, 131072 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes


Disk /dev/ram5: 64 MiB, 67108864 bytes, 131072 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes


Disk /dev/ram6: 64 MiB, 67108864 bytes, 131072 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes


Disk /dev/ram7: 64 MiB, 67108864 bytes, 131072 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes


Disk /dev/ram8: 64 MiB, 67108864 bytes, 131072 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes


Disk /dev/ram9: 64 MiB, 67108864 bytes, 131072 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes


Disk /dev/ram10: 64 MiB, 67108864 bytes, 131072 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes


Disk /dev/ram11: 64 MiB, 67108864 bytes, 131072 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes


Disk /dev/ram12: 64 MiB, 67108864 bytes, 131072 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes


Disk /dev/ram13: 64 MiB, 67108864 bytes, 131072 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes


Disk /dev/ram14: 64 MiB, 67108864 bytes, 131072 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes


Disk /dev/ram15: 64 MiB, 67108864 bytes, 131072 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes


Disk /dev/sda: 465.8 GiB, 500107862016 bytes, 976773168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: dos
Disk identifier: 0x64174376

设备 启动 Start 末尾 扇区 Size Id 类型
/dev/sda1 * 2048 3074047 3072000 1.5G 7 HPFS/NTFS/exFAT
/dev/sda2 3074048 212789247 209715200 100G 7 HPFS/NTFS/exFAT
/dev/sda3 212791294 948099071 735307778 350.6G f W95 扩展 (LBA)
/dev/sda4 948099072 976771071 28672000 13.7G 7 HPFS/NTFS/exFAT
/dev/sda5 212791296 422506495 209715200 100G 7 HPFS/NTFS/exFAT
/dev/sda6 422508544 738381823 315873280 150.6G 7 HPFS/NTFS/exFAT
/dev/sda7 738383872 838381567 99997696 47.7G 83 Linux
/dev/sda8 838383616 938381311 99997696 47.7G 83 Linux
/dev/sda9 938383360 948099071 9715712 4.6G 82 Linux 交换 / Solaris

Partition 3 does not start on physical sector boundary.
Partition table entries are not in disk order.


Disk /dev/sdb: 3.8 GiB, 4089446400 bytes, 7987200 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: 0x02d12754

设备 启动 Start 末尾 扇区 Size Id 类型
/dev/sdb4 * 63 7987199 7987137 3.8G c W95 FAT32 (LBA)

1. 卸載 是 針對分割區 不是針對 u 盤
sudo umount /dev/sdb4

2. 看看卸載以後 行不行

3. 如果還是不行 依序參閱
https://wiki.ubuntu.com/Win32DiskImager ... FormatHelp
3-1. Format the pendrive with gparted (in linux)
3-2. Wipe the first megabyte - only in special cases
3-3. Wipe the whole pendrive - only in special cases

sdb4之前已经卸载，还是不行，
我试试win32DiskImager吧，之前不想打开windows

终于搞定15.10的live cd了：
1. 先使用15.10自带的启动盘制作器烧iso，成功后会发现这时的live cd由于syslinux的版本问题导致启动失败。
2. 下载并解压syslinux-6.03-pre20.tar.gz，地址：https://www.kernel.org/pub/linux/utils/boot/syslinux/Testing/6.03/syslinux-6.03-pre20.tar.gz
3.输入命令：
# 删除启动引导信息（命令中/media/ubuntu/6EA3-4D76表示u盘挂载位置，请根据u盘挂载情况自行更改）
$cd /media/ubuntu/6EA3-4D76
$rm -rf \[BOOT\]/
# 安装新的syslinux
$cd ~/syslinux-6.03-pre20/bios/linux
$sudo ./syslinux -d syslinux -i /dev/sdXX（具体目录根据实际情况而定）
自此制作完成！

参考了以下文章：http://www.linuxdiyf.com/linux/15195.html