[桌面系统] line 46:can't open /dev/sdb:No medium found

[weixin_38056491]

试装机器是dell inspiron mini1018.硬盘250G,内存找人换的2G,原装操作系统为winxp.
      这几天都在winxp下用硬盘安装ubuntu,一直没成功.开始安装的是ubuntu10.10,desktop&netbook都试过都,进入了图形安装界面,但是出现过cdrom挂载和一直检测文件系统的问题.没有解决过. 在一次分区时不小心整个硬盘全部格式化成exe3文件格式,ubuntu没安装成功,winxp也被消失.后来用茄子U盘安装winPE重新装了winxp,成功.再实验在winxp下硬盘装ubuntu时,无论ubuntu10.10 desktop&netbook还是刚出来的ubuntu11.04,均出现以下情况.
      ubuntu-11.04-desktop-i386.iso镜像文件在C盘（C盘位xp的系统盘）
    boot.ini中添加C:\grldr='ubuntu'
      initrd.gz；grldr；vmlinuz；menu.lst放C盘，menu.ls正确修改
    重启电脑，选择安装ubuntu，显示启动ubuntu标志，渐明渐暗的ubuntu图标，几分钟后出现黑屏，显示如下信息:

  Booting 'Install Ubuntu'
Filesystem type is fat,partition type 0xc
   [Linux-bzimage,setup=0x3800,size=0x44c350]
   [Linux-initrd @ 0x7e8fb000,0xcc49b3 bytes]

BusyBox v1.17.1(ubuntu 1:1.17.1-10ubuntu1) built-in shell (ash)
Enter 'help' for a list of built-in commands.

(initramfs) /scripts/casper-premount/20iso_scan:line 46:can't open /dev/sdb:No medium found
Could not find the ISO /ubuntu-11.04-desktop-i386.iso
This could also happen if the file system is not clean because of an operating
system crash,an interrupted boot process,an improper shutdown,or unplugging
of a removable device without first unmounting or ejecting it. To fix this,
simply reboot into Windows, let it fully start,log in,run 'chkdsk /r',then
gracefulty shut down and reboot back into Windows. After this you should be
able to reboot again and resume the installation.