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[Sergio Durigan Junior <1916391@xxxxxxxxxxxxxxxxxx>]

Thanks for the report.

I can confirm this behaviour.  Here are the reproduction steps, assuming
you're in a Focal VM:

# apt install samba apache2 curl cifs-utils
# cat << EOF >> /etc/samba/smb.conf
[testshare]
  path = /testshare
  browseable = yes
  read only = yes
  guest ok = yes
EOF
# mkdir /testshare
# dd if=/dev/random of=/testshare/test.data bs=1M count=1
# mount -t cifs -o guest //127.0.0.1/testshare /mnt
# sed -i 's@DocumentRoot.*@DocumentRoot /mnt\n\t<Directory /mnt>\n\t\tRequire all granted\n\t</Directory>' /etc/apache2/sites-enabled/000-default.conf
# systemctl restart apache2
# curl http://localhost/test.data -H 'Range: bytes=0-1'
curl: (1) Received HTTP/0.9 when not allowed


I marked the bug as Invalid because you can use "EnableMMAP Off" in order to get things working.  I agree that this should perhaps be better documented, though.

Can you confirm whether "EnableMMAP Off" works in your case?  Also,
"EnableSendFile Off" may be needed as well.

** Changed in: apache2 (Ubuntu)
       Status: Triaged => Invalid

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https://bugs.launchpad.net/bugs/1916391

Title:
  Range requests broken on CIFS mounted document root

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