diff --git a/ulib/debian b/ulib/debian
index d0fa520..a7a2ecd 100644
--- a/ulib/debian
+++ b/ulib/debian
@@ -508,7 +508,6 @@ $1 == "iface" {
 }
 $1 ~ /^(allow-)?auto$/ {
   for (i = 2; i <= NF; i++) {
-print "auto: " $i ", iface=" iface
     if ($i == iface) {
       have_auto = 1
     }
@@ -518,7 +517,6 @@ print "auto: " $i ", iface=" iface
 }
 $1 == "allow-hotplug" {
   for (i = 2; i <= NF; i++) {
-print "hotplug: " $i ", iface=" iface
     if ($i == iface) {
       have_hotplug = 1
     }
@@ -554,8 +552,109 @@ function network_interfaces_check_confip() {
     __network_interfaces_check_confip
 }
 
+function __network_interfaces_remove_iface() {
+    awkrun -f iface="$1" '
+function match_iface(iface, line) {
+  if (line == "") line = $0 " "
+  return line ~ (" " iface " ")
+}
+function remove_auto_iface(iface, line) {
+  if (line == "") line = $0 " "
+  gsub(" " iface " ", " ", line)
+  return line
+}
+function print_auto_iface(line) {
+  if (line ~ /^(allow-)?auto *$/) {
+    # une seule interface sur la ligne: ne pas l"afficher
+  } else {
+    # supprimer l"interface de la ligne
+    sub(/ *$/, "", line)
+    print line
+  }
+}
+function remove_hotplug_iface(iface, line) {
+  if (line == "") line = $0
+  if (line !~ / $/) line = line " "
+  gsub(" " iface " ", " ", line)
+  return line
+}
+function print_hotplug_iface(line) {
+  if (line ~ /^allow-hotplug *$/) {
+    # une seule interface sur la ligne: ne pas l"afficher
+  } else {
+    # supprimer l"interface de la ligne
+    sub(/ *$/, "", line)
+    print line
+  }
+}
+
+BEGIN {
+  in_iface = 0
+  found_iface = 0
+  modified = 0
+}
+!found_iface && $1 == "iface" && $2 == iface && $3 == "inet" {
+  in_iface = 1
+  found_iface = 1
+  modified = 1
+  next
+}
+$1 == "iface" {
+  in_iface = 0
+}
+$1 ~ /^(allow-)?auto$/ {
+  in_iface = 0
+  if (match_iface(iface)) {
+    print_auto_iface(remove_auto_iface(iface))
+    modified = 1
+    next
+  }
+}
+$1 == "allow-hotplug" {
+  in_iface = 0
+  if (match_iface(iface)) {
+    print_hotplug_iface(remove_hotplug_iface(iface))
+    modified = 1
+    next
+  }
+}
+!in_iface { print }
+END {
+  if (modified) exit 0
+  else exit 1
+}'
+}
 function network_interfaces_remove_iface() {
-    :
+    # Supprimer dans le fichier $2(=/etc/network/interfaces) toute la
+    # configuration qui concerne l'interface $1
+    local iface="$1" nifile="${2:-/etc/network/interfaces}"
+    local tmpfile; ac_set_tmpfile tmpfile
+    local modified
+    if __network_interfaces_remove_iface "$iface" <"$nifile" >"$tmpfile"; then
+        cat "$tmpfile" >"$nifile"
+        modified=1
+    fi
+    ac_clean "$tmpfile"
+    [ -n "$modified" ]
+}
+function network_interfaces_remove_ifaces() {
+    # Supprimer dans le fichier $2(=/etc/network/interfaces) toute la
+    # configuration qui concerne les interfaces du tableau $1=(ifaces)
+    local -a __niri_ifaces; array_copy __niri_ifaces "${1:-ifaces}"
+    local nifile="${2:-/etc/network/interfaces}"
+    local workfile; ac_set_tmpfile workfile
+    local tmpfile; ac_set_tmpfile tmpfile
+    local iface modified
+    cat "$nifile" >"$workfile"
+    for iface in "${__niri_ifaces[@]}"; do
+        if __network_interfaces_remove_iface "$iface" <"$workfile" >"$tmpfile"; then
+            cat "$tmpfile" >"$workfile"
+            modified=1
+        fi
+    done
+    [ -n "$modified" ] && cat "$workfile" >"$nifile"
+    ac_clean "$workfile" "$tmpfile"
+    [ -n "$modified" ]
 }
 
 function network_interfaces_add_confbr() {