I am replying to an old thread which described the same or similar problem that I had. I have a solution which may be useful to store in the mailing list archives. The thread started with this message:
https://lists.debian.org/debian-user/2018/05/msg00391.html
* 2018-05-11 11:11:42-0500, Kent West wrote:
> I have a Dell Latitude E7250 laptop. I'm trying to install Debian to
> it using a USB stick.
> The real problem is that after going through the first three or four
> screens, the install halts, complaining about not being able to read
> the CD-ROM.
I have Dell Latitude E6230 and the same problem: The installer boots and
I can choose country and language settings. Then the installer tries to
detect and mount the installer drive but fails to detect it. I confirmed
that in installer's console: command "ls /dev" lists only the main hard
disk device files /dev/sda and its partitions.
The solution that worked for me: I removed the installer USB stick and
inserted it again. Then the installer finds the device and proceeds with
the install. Technically there is now device file /dev/sdb and its
partitions.
--
/// Teemu Likonen - .-.. https://www.iki.fi/tlikonen/
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