ubuntu 启动进入initramfs错误解决办法

安装完ubuntu 9.04启动到grub时出现waiting for loading…后提示找不到root device，然后跳入initramfs，这时如果运行exit可以进入系统说明rootdelay时间太短了，解决办法：

sudo vi /boot/grub/menu.lis

可以看到要启动的grub项目：

## ## End Default Options ##

title           Ubuntu 9.04, kernel 2.6.28-11-server
uuid            c757c22c-b798-433a-b284-8bca8e084406
kernel          /vmlinuz-2.6.28-11-server root=/dev/mapper/shangri--la-root ro quiet splash
initrd          /initrd.img-2.6.28-11-server
quiet

title           Ubuntu 9.04, kernel 2.6.28-11-server (recovery mode)
uuid            c757c22c-b798-433a-b284-8bca8e084406
kernel          /vmlinuz-2.6.28-11-server root=/dev/mapper/shangri--la-root ro  single
initrd          /initrd.img-2.6.28-11-server

title           Ubuntu 9.04, memtest86+
uuid            c757c22c-b798-433a-b284-8bca8e084406
kernel          /memtest86+.bin
quiet

这里在第一项里面的kernel行中加入rootdela=90如下：

## ## End Default Options ##

title           Ubuntu 9.04, kernel 2.6.28-11-server
uuid            c757c22c-b798-433a-b284-8bca8e084406
kernel          /vmlinuz-2.6.28-11-server root=/dev/mapper/shangri--la-root ro quiet splash rootdelay=90
initrd          /initrd.img-2.6.28-11-server
quiet

title           Ubuntu 9.04, kernel 2.6.28-11-server (recovery mode)
uuid            c757c22c-b798-433a-b284-8bca8e084406
kernel          /vmlinuz-2.6.28-11-server root=/dev/mapper/shangri--la-root ro  single
initrd          /initrd.img-2.6.28-11-server

title           Ubuntu 9.04, memtest86+
uuid            c757c22c-b798-433a-b284-8bca8e084406
kernel          /memtest86+.bin
quiet

重启后正常。