im trying to install lucid beta2 from the alternate install iso too.
i used unetbootin to create a bootable usb stick from the
ubuntu-10.04-beta2-alternate-amd64.iso (20100406) (and i tried to use pxe+nfs
too, but since network is not available before detecting the "cdrom", there is
no (easy?) way to get it working without a stick)
the first problem, as the op described, the alternate cd has no way to _not_
use a cdrom as source and bails out if it can't find one.
this can be circumvented by loop-mounting the .iso manually after the installer
tells you that the "detect and mount CD-ROM" "installation step failed"
("main-menu ls: /lib/modules/*/*kernel/drivers/cdrom/: no such file or
directory" in the syslog)
after mounting manually with "mount -tiso9660 -oloop iso /cdrom" in
a console, selecting "load debconf preconfiguration file" continues the
installation normally.
after partitioning "install the base system" fails with "debootstrap error -
failed to determine the codename for the release" (syslog: "base-installer:
error: exiting on error base-installer/no_codename").
according to debian bug 509775: "This typically happens because users get
"creative" with combining
different installation methods or because they manually mount/unmount
things, not because of any real issue in the installer."
--
not finding cd drivers throws fatal error even though using USB
https://bugs.launchpad.net/bugs/552022
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