Feelings of hard disk reinstallation Ubuntu12.04

Hard disk reinstallation Ubuntu12.04 has not been added to the blog for a long time. The system has encountered problems in the last two days. the Windows 7 blue screen and ubuntu cannot be accessed ~. Later, Windows 7 was better, and ubuntu was still stubborn. I am used to linux, so I don't want to switch to Windows 7. I guess I am used to all kinds of command-making ~ I .. hard disk reinstallation Ubuntu12.04 feel for a long time no more blog, the system has encountered problems in the last two days, win7 blue screen, ubuntu can not enter ~. Later, Windows 7 was better, and ubuntu was still stubborn. I am used to linux, so I don't want to switch to Windows 7. I guess I am used to all kinds of command-making ~ I. computer system: dual system: ubuntu 12.10 64-bit windows 7 flagship edition 64-bit II. why should I reinstall it? Install PacketTracer to learn the network. And install wine-thunder (linux-based thunder ). When you restart your computer, The ubuntu system reports an error: The system is running in low-graphics mode has tried The methods on The ubuntu Forum. in general, there are three main cases. After one attempt, there was no response. I find the system logs, but I don't know where to start. it's sad for new users ~ After debugging for more than one day, it improved and encountered a new problem: after entering the password on the login interface, a black screen was displayed. the login interface was flashed back and the system could not be accessed. In view of the fact that the task has not been completed this week, and the requirement for system configuration for learning new knowledge, we have no time to study this issue, so we have no choice but to reinstall the system. III. preparations for reinstallation nuclear issue Ext2Read software was installed in windows before, so back up the home files in windows, My ubuntu one network disk also has a backup. It is useful to develop backup habits ~ The previously burned ubuntu disk is damaged, and it is still failed to burn it again. it is estimated that there is a problem with the disc I bought in the school (I tested three computers and destroyed many CDs, all are money ~), No way, there are two options: 1. u disk installation 2. hard disk installation (not wubi installation ). I found that ubuntu 64-bit systems run slowly on my machine, which is not ubuntu's speed. At the beginning, 12.10 was installed for a good gnome Desktop (gnome-tweak-tool had bugs in 12.04, but it was fixed in 12.10). now it doesn't matter if you're tired. And 64-bit system also need to install 32-bit support (ia32-libs), on the premise that I have not configured the campus network client is not on the network. In addition, the script I wrote on the 64-bit operating system cannot be used without 32-bit installation. For the above reasons, I am going to give up installing 12.10 and return to 12.04 ...... 4. all the operations in the installation procedure are mainly 1. according to my operations, there are some differences: 1. I copied my 12.04 image to the root directory of drive C. I didn't copy it before, so I failed to start it. 2. after the system is started, you must uninstall the isodevice: sudo umount-l/isodevice before installation. Otherwise, the system will prompt you to uninstall the isodevice during installation, then, the Master Card (my master card is used ~).