Note, I removed the CD-ROM entries from my sources.list and apt update now
completes without error:
   root@debian:/etc/apt# apt update
   Hit:1 http://deb.debian.org/debian buster-updates InRelease
   Hit:2 http://security.debian.org/debian-security buster/updates InRelease
   Reading package lists... Done
   Building dependency tree
   Reading state information... Done
   All packages are up to date.
   root@debian:/etc/apt#

I still can't find any cross-build-essential results from apt-cache search.



On Sun, Sep 15, 2019 at 2:31 PM Brian Tremaine <[email protected]> wrote:

> Hi Dennis,
> I edited my sources.list as attached, adding the [trusted=yes]. I think
> this was the key. Now when I run apt update I get a longer response and no
> warnings of untrusted repository.
>
> After that I was able to the following commands to install Guest Additions:
>     apt-get update && apt-get upgrade
>     apt-get install build-essential module-assistant
>     m-a prepare
>          ------> then Under Devices select Insert Guest Additions CD
> Image...
>          this evidently causes VB to download GuestAdditions iso image
>     mount /media/cdrom
>     sh /media/cdrom/VBoxLinuxAdditions.run
>
> The install then proceeded and took a couple minutes after it  downloaded
> a GuestAdditions iso image. It didn't use any Guest Additions file that I
> downloaded.
>
> I can now use Guest Addition features such as copy & paste and change
> window size.
>
> My apt update still shows errors (near bottom) and I can't install any
> crossbuild essential files. apt-cache search cross-build-essential still
> gives no response. I get an error:  "Please use apt-cdrom to make this
> CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs".
>
> Regards,
>
>
> On Sun, Sep 15, 2019 at 1:49 PM Dennis Lee Bieber <[email protected]>
> wrote:
>
>> On Sun, 15 Sep 2019 10:53:12 -0700, Brian Tremaine
>> <[email protected]> declaimed the
>> following:
>>
>> >Thanks Dennis, I'll give this a try today !!
>> >On the guest additions I downloaded a deb file but when I try to mnt in
>> the
>> >cdrom it errors with invalid file type. This project (VM & installing
>> >tools) is definitely a much bigger project than anticipated. ...
>> >
>>
>>         You don't "mount" deb package files.
>>
>>         You copy them to a location in the Debian OS, and use apt to
>> install
>> them...
>>
>>         I think I'd downloaded them on the Windows side, then sftp to my
>> working directory -- I'd tried (again, from the shell command history
>> file)
>>
>>    18  sudo apt-get install linux-headers-$(uname -r)
>>    19  ls
>>    20  sudo apt install ./virtualbox-guest-dkms_6.0.10-dfsg-5_all.deb
>>    21  sudo apt install ./virtualbox-guest-utils_6.0.10-dfsg-5_amd64.deb
>>    22  sudo apt install ./virtualbox-guest-x11_6.0.10-dfsg-5_amd64.deb
>>    23  sudo apt install ./virtualbox-guest-utils_6.0.10-dfsg-5_amd64.deb
>>    24  sudo wget -O -
>>
>> https://db.debian.org/fetchkey.cgi?fingerprint=FEDEC1CB337BCF509F43C2243914B532F4DFBE99
>> | apt-key add
>>    25  sudo su
>>    26  ls
>>    27  sudo apt-get remove virtualbox-guest-utils
>>    28  sudo apt install ./virtualbox-guest-utils_6.0.10-dfsg-5_amd64.deb
>> ./virtualbox-guest-x11_6.0.10-dfsg-5_amd64.deb
>>
>> but they didn't seem to work properly. Later after finding some version in
>> ISO format (VBoxGuestAdditions_6.0.12.iso -- Oh, and I seem to be running
>> VBox 6.0.12 also -- so fresh it wasn't on the Oracle download page, but
>> showed up as an option when running the .10 installer in some advanced
>> mode), mounting it, copying the contents to a directory on disk, and then
>> running the install script (I've NEVER managed to get the installer to run
>> from "CD" image). The copy was done using drag&drop, so not visible in the
>> command lines
>>
>>    31  mkdir ga
>>    32  cd ga
>>    33  sudo ./autorun.sh
>>    34  cd ..
>>    35  ls
>>    36  ls -al
>>    37  sudo adduser wulfraed vboxsf
>>
>>         I also had to shutdown the virtual machine and reboot it for some
>> changes to take place. The last command above was to make the shared
>> folder
>> work for my user account. The shutdown/reboot seemed needed to make both
>> the shared folder and clipboard sharing work (I did, for some time, also
>> have problems with mouse integration).
>>
>> wulfraed@debian:~$ ls -l Downloads/ ga/
>> Downloads/:
>> total 103972
>> -rw-r--r-- 1 wulfraed wulfraed 55446104 Sep 11 12:22
>> code_1.38.0-1567547996_amd64.deb
>> -rw-r--r-- 1 wulfraed wulfraed 51016290 Sep 13 13:53
>> eclipse-inst-linux64.tar.gz
>>
>> ga/:
>> total 62800
>> -r--r--r-- 1 wulfraed wulfraed      763 Jan 21  2019 AUTORUN.INF
>> -r-xr-xr-x 1 wulfraed wulfraed     6384 Sep  3 05:50 autorun.sh
>> drwxr-xr-x 2 wulfraed wulfraed     4096 Sep 11 11:33 cert
>> drwxr-xr-x 2 wulfraed wulfraed     4096 Sep 11 11:33 NT3x
>> drwxr-xr-x 2 wulfraed wulfraed     4096 Sep 11 11:33 OS2
>> -r-xr-xr-x 1 wulfraed wulfraed     4821 Sep  3 05:50 runasroot.sh
>> -r--r--r-- 1 wulfraed wulfraed      547 Sep  3 05:56 TRANS.TBL
>> -r--r--r-- 1 wulfraed wulfraed  3732295 Sep  3 05:49
>> VBoxDarwinAdditions.pkg
>> -r--r--r-- 1 wulfraed wulfraed     3949 Sep  3 05:49
>> VBoxDarwinAdditionsUninstall.tool
>> -r-xr-xr-x 1 wulfraed wulfraed  8611252 Sep  3 05:50
>> VBoxLinuxAdditions.run
>> -r--r--r-- 1 wulfraed wulfraed 16587264 Sep  3 05:51
>> VBoxSolarisAdditions.pkg
>> -r-xr-xr-x 1 wulfraed wulfraed 22919928 Sep  3 05:55
>> VBoxWindowsAdditions-amd64.exe
>> -r-xr-xr-x 1 wulfraed wulfraed   270104 Sep  3 05:50
>> VBoxWindowsAdditions.exe
>> -r-xr-xr-x 1 wulfraed wulfraed 12135576 Sep  3 05:52
>> VBoxWindowsAdditions-x86.exe
>> wulfraed@debian:~$
>>
>>         I hate updating VirtualBox. Seems I have to do an Uninstall of
>> the old
>> version, and a Windows reboot -- otherwise some remnant file corrupts the
>> new one start-up.
>>
>>
>>
>>
>> --
>>         Wulfraed                 Dennis Lee Bieber         AF6VN
>>         [email protected]
>> http://wlfraed.microdiversity.freeddns.org/
>>
>> --
>> For more options, visit http://beagleboard.org/discuss
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>> .
>>
>
>
> --
> *TremaineConsultingGroup.com*
> LinkedIn <https://linkedin.com/in/btremaine/>
>
> 669-273-6035
>


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