For manual installation, don't set hostname nor interface to be able to chose during installation

dnsmasq_lille.sh

@@ -36,8 +36,8 @@ then
   set hostname=lille-edu-capri-002
   set inteface=eno1
 else
-  set hostname=unknown
-  set interface=unknown
+  set hostname=
+  set interface=
 fi
 
 unset timeout
@@ -47,7 +47,7 @@ menuentry 'Debian Installer (automatic install) ttyS0' {
   initrd /debian-installer/amd64/initrd.gz
 }
 menuentry 'Debian Installer (manual install) ttyS0' {
-  linux /debian-installer/amd64/linux vga=788 language=C country=FR keymap=fr hostname=\$hostname domain= interface=\$interface --- mitigations=off console=ttyS0,57600
+  linux /debian-installer/amd64/linux vga=788 language=C country=FR keymap=fr domain= --- mitigations=off console=ttyS0,57600
   initrd /debian-installer/amd64/initrd.gz
 }
 menuentry 'Debian Installer (automatic install) ttyS1' {
@@ -55,11 +55,11 @@ menuentry 'Debian Installer (automatic install) ttyS1' {
   initrd /debian-installer/amd64/initrd.gz
 }
 menuentry 'Debian Installer (manual install) ttyS1' {
-  linux /debian-installer/amd64/linux vga=788 language=C country=FR keymap=fr hostname=\$hostname domain= interface=\$interface --- mitigations=off console=ttyS1,57600
+  linux /debian-installer/amd64/linux vga=788 language=C country=FR keymap=fr domain= --- mitigations=off console=ttyS1,57600
   initrd /debian-installer/amd64/initrd.gz
 }
 menuentry 'Ubuntu Installer ttyS0' {
-  linux /ubuntu-installer/amd64/linux vga=788 language=C country=FR keymap=fr --- mitigations=off console=ttyS0,57600
+  linux /ubuntu-installer/amd64/linux vga=788 language=C country=FR keymap=fr domain= --- mitigations=off console=ttyS0,57600
   initrd /ubuntu-installer/amd64/initrd.gz
 }
 menuentry 'SystemRescueCd' {