This also affects Lucid and the PowerPC port on an Apple iMac G3
(PowerPC 750, 500MHz, PowerMac2,2, NewWorld).

In my case the original CD-RW had 2 packages with bad checksums causing
installation problems so I returned to the menu, ejected the CD, and
inserted a fresh CD-RW containg the same image.

When re-running the Install Software Selection tasksel the dialog reads:

Please insert the disc labeled 'Ubuntu 10.04 _Lucid Lynx_ - Alpha
powerpc (20100419)' in the driver /cdrom/ and press enter.

Media change

<Continue>

Despite inserting the CD, when pressing Enter the same dialog returns
and there is no option to go back to the selection menu.

On tty2 (Alt+F2) I mounted the CD manually from the busybox shell:

mount /deb/hdb /cdrom/

and compared "/cdrom/README.diskdefines" DISKNAME:

#define DISKNAME Ubuntu 10.04 "Lucid Lynx" - Alpha powerpc

with "/var/log/media-info":

Ubuntu 10.04 "Lucid Lynx" - Alpha powerpc (20100419)

I then realised the chroot for /target/ might not have the cdrom mounted
so I did:

chroot /target
mount /deb/hdb /cdrom
exit

And then switched back to tty1 (Alt+F1) and when pressing "<continue>"
the installation continued.

I suspect I could have avoided the mount command inside the chroot by
doing:

mount /dev/hdb /target/cdrom

in the busybox shell.

-- 
Alternate install fails requesting same disc
https://bugs.launchpad.net/bugs/360460
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