Upgrade to ubuntu 13.04 from 12.04 with iso image

Question 1

I have ubuntu 12.04 installed on my system. I want to upgrade it to ubuntu 13.04. I want to do this upgrade using an iso image of ubuntu 13.04.

I tried this Solution

But it didn’t work for me.

After running these command I didn’t get any alerts about updating. Also I don’t understand the gksu part of the solution.

Here are the steps I tried:

sudo mount -t iso9660 -o loop PATH/TO/ISO /cdrom

then

sudo /cdrom/cdromupgrade

Read more: http://linuxpoison.blogspot.tw/2011/06/how-to-upgrade-ubuntu-using-alternate.html#ixzz2SFMqlOPx

I also wanted to know, If I can do this using a networked computer. By this I mean the iso file is on some other computer.

Thank you.

Question 2

The basic steps you need to do in order to upgrade from an ISO image are

Download the Alternate ISO.
Mount the ISO in the /media/cdrom directory. First create the directory if it doesn’t exist, then mount the image.
```
sudo mkdir -p /media/cdrom  
sudo mount -t iso9660 -o loop PATH/TO/ISO /media/cdrom
```
The solution you posted assumes that as soon as you mount the ISO, it will automatically cause a dialog to appear asking you whether to upgrade. This may or may not happen on your system depending on the Desktop Environment you are using and its autorun settings. If it doesn’t, launch the upgrader manually as described below.
Run the cdromupgrade command which is on the ISO, it needs to run with root priviledges, so you need sudo.
```
sudo /media/cdrom/cdromupgrade
```
or
```
gksu "sh /media/cdrom/cdromupgrade"
```
gksu is a graphical frontend to su, it is a just a way of entering your password graphically to get root privileges. The two commands are equivalent, they just run cdromupgrade.

You can use a remote ISO but it is probably a better idea to copy it to your local machine, then mount it as described above:

scp user@remote.machine:/path/to/source /path/to/target

If you need to use a remote image, you will still need to mount it locally. I don’t know what kind of access you have to the remote server (ssh, ftp, nfs, smb etc), so I can’t tell you how to mount it locally. If you have root access to the local machine you could use sshfs and mount the directory containing the ISO:

sudo apt-get install fuse-utils sshfs
sudo adduser USER fuse
sshfs user@remote.machine:/path/to/ISO_DIR /local/mount/point
sudo mount -t iso9660 -o loop /local/mount/point/Ubuntu.iso /media/cdrom

Alternatively, you can log on to the remote machine and install from there (copied directly from here, the author is @KyleBrandt):

Get the alternate install cd.
Mount the .iso image or burn it and put it in the cdrom drive: To mount the iso image, first create the /mnt/iso directory with mkdir /mnt/iso and then: sudo mount ubuntu-8.10-alternate-i386.iso /mnt/iso/ -t iso9660 -o ro,loop=/dev/loop0
ssh into your remote machine you wish to upgrade: ssh remote-machine
(Optional, but highly recommended): Start a screen session so if you get disconnected it won’t interrupt the upgrade (read how to use screen here): screen
Within the screen session, start a text-based cdrom upgrade with the following command: sudo /mnt/iso/cdromupgrade –frontend=DistUpgradeViewText
The upgrade will periodically ask you yes/no questions throughout the upgrade, so it is not unattended. If you really wanted it to you could try using the yes command and a pipe to force yes to all, but I wouldn’t recommend it and am not sure if it would work:-) One odd thing is if you type ‘d’ for details it opens the information in the program ‘less’, so if you chose this just press ‘q’ to quit after you are done reading the information.

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