have made the change to 'set -ex' as proposed; but the update still fails:

 sudo gedit /usr/share/initramfs-tools/dhcpcd
[sudo] Mot de passe de bilal : 
bilal@ub64:~$ sudo gedit /usr/share/initramfs-tools/hooks/dhcpcd
bilal@ub64:~$ sudo update-initramfs -u
update-initramfs: Generating /boot/initrd.img-6.3.0-7-generic
+ PREREQ=
+ prereqs
+ echo 
+ exit 0
+ PREREQ=
+ . /usr/share/initramfs-tools/hook-functions
+ [ -x /usr/sbin/dhcpcd ]
+ copy_exec /usr/sbin/dhcpcd
+ local src target x nonoptlib ret
+ src=/usr/sbin/dhcpcd
+ target=/usr/sbin/dhcpcd
+ copy_file binary /usr/sbin/dhcpcd /usr/sbin/dhcpcd
+ local type src target link_target
+ type=binary
+ src=/usr/sbin/dhcpcd
+ target=/usr/sbin/dhcpcd
+ [ -f /usr/sbin/dhcpcd ]
+ [ -d /var/tmp/mkinitramfs_jDe2k2//usr/sbin/dhcpcd ]
+ [ -e /var/tmp/mkinitramfs_jDe2k2//usr/sbin/dhcpcd ]
+ mkdir -p /var/tmp/mkinitramfs_jDe2k2//usr/sbin
+ [ -h /usr/sbin/dhcpcd ]
+ [ n = y ]
+ cp -pP /usr/sbin/dhcpcd /var/tmp/mkinitramfs_jDe2k2//usr/sbin/dhcpcd
+ env --unset=LD_PRELOAD ldd /usr/sbin/dhcpcd
+ sed -e 
		/\//!d;
		/linux-gate/d;
		/=>/ {s/.*=>[[:blank:]]*\([^[:blank:]]*\).*/\1/};
		s/[[:blank:]]*\([^[:blank:]]*\) (.*)/\1/
+ echo /lib/x86_64-linux-gnu/libc.so.6
+ sed -e s#/lib/\([^/]*/\)\?\(tls\|i686\|sse2\|neon\|vfp\).*/\(lib.*\)#/lib/\1\3#
+ nonoptlib=/lib/x86_64-linux-gnu/libc.so.6
+ echo /lib/x86_64-linux-gnu/libc.so.6
+ sed -e s#-linux-gnu/\(tls\|i686\|sse2\|neon\|vfp\).*/\(lib.*\)#-linux-gnu/\2#
+ nonoptlib=/lib/x86_64-linux-gnu/libc.so.6
+ [ -e /lib/x86_64-linux-gnu/libc.so.6 ]
+ x=/lib/x86_64-linux-gnu/libc.so.6
+ copy_file binary /lib/x86_64-linux-gnu/libc.so.6
+ local type src target link_target
+ type=binary
+ src=/lib/x86_64-linux-gnu/libc.so.6
+ target=/lib/x86_64-linux-gnu/libc.so.6
+ [ -f /lib/x86_64-linux-gnu/libc.so.6 ]
+ [ -d /var/tmp/mkinitramfs_jDe2k2//lib/x86_64-linux-gnu/libc.so.6 ]
+ target=/usr/lib/x86_64-linux-gnu/libc.so.6
+ [ -e /var/tmp/mkinitramfs_jDe2k2//usr/lib/x86_64-linux-gnu/libc.so.6 ]
+ return 1
+ ret=1
+ [ 1 = 1 ]
+ echo /lib64/ld-linux-x86-64.so.2
+ sed -e s#/lib/\([^/]*/\)\?\(tls\|i686\|sse2\|neon\|vfp\).*/\(lib.*\)#/lib/\1\3#
+ nonoptlib=/lib64/ld-linux-x86-64.so.2
+ echo /lib64/ld-linux-x86-64.so.2
+ sed -e s#-linux-gnu/\(tls\|i686\|sse2\|neon\|vfp\).*/\(lib.*\)#-linux-gnu/\2#
+ nonoptlib=/lib64/ld-linux-x86-64.so.2
+ [ -e /lib64/ld-linux-x86-64.so.2 ]
+ x=/lib64/ld-linux-x86-64.so.2
+ copy_file binary /lib64/ld-linux-x86-64.so.2
+ local type src target link_target
+ type=binary
+ src=/lib64/ld-linux-x86-64.so.2
+ target=/lib64/ld-linux-x86-64.so.2
+ [ -f /lib64/ld-linux-x86-64.so.2 ]
+ [ -d /var/tmp/mkinitramfs_jDe2k2//lib64/ld-linux-x86-64.so.2 ]
+ target=/usr/lib64/ld-linux-x86-64.so.2
+ [ -e /var/tmp/mkinitramfs_jDe2k2//usr/lib64/ld-linux-x86-64.so.2 ]
+ return 1
+ ret=1
+ [ 1 = 1 ]
+ copy_exec /usr/lib/dhcpcd/dhcpcd-run-hooks
+ local src target x nonoptlib ret
+ src=/usr/lib/dhcpcd/dhcpcd-run-hooks
+ target=/usr/lib/dhcpcd/dhcpcd-run-hooks
+ copy_file binary /usr/lib/dhcpcd/dhcpcd-run-hooks /usr/lib/dhcpcd/dhcpcd-run-hooks
+ local type src target link_target
+ type=binary
+ src=/usr/lib/dhcpcd/dhcpcd-run-hooks
+ target=/usr/lib/dhcpcd/dhcpcd-run-hooks
+ [ -f /usr/lib/dhcpcd/dhcpcd-run-hooks ]
+ [ -d /var/tmp/mkinitramfs_jDe2k2//usr/lib/dhcpcd/dhcpcd-run-hooks ]
+ [ -e /var/tmp/mkinitramfs_jDe2k2//usr/lib/dhcpcd/dhcpcd-run-hooks ]
+ mkdir -p /var/tmp/mkinitramfs_jDe2k2//usr/lib/dhcpcd
+ [ -h /usr/lib/dhcpcd/dhcpcd-run-hooks ]
+ [ n = y ]
+ cp -pP /usr/lib/dhcpcd/dhcpcd-run-hooks /var/tmp/mkinitramfs_jDe2k2//usr/lib/dhcpcd/dhcpcd-run-hooks
+ env --unset=LD_PRELOAD ldd /usr/lib/dhcpcd/dhcpcd-run-hooks
+ sed -e 
		/\//!d;
		/linux-gate/d;
		/=>/ {s/.*=>[[:blank:]]*\([^[:blank:]]*\).*/\1/};
		s/[[:blank:]]*\([^[:blank:]]*\) (.*)/\1/
+ copy_file config /usr/lib/dhcpcd/dhcpcd-hooks/30-hostname
+ local type src target link_target
+ type=config
+ src=/usr/lib/dhcpcd/dhcpcd-hooks/30-hostname
+ target=/usr/lib/dhcpcd/dhcpcd-hooks/30-hostname
+ [ -f /usr/lib/dhcpcd/dhcpcd-hooks/30-hostname ]
+ [ -d /var/tmp/mkinitramfs_jDe2k2//usr/lib/dhcpcd/dhcpcd-hooks/30-hostname ]
+ [ -e /var/tmp/mkinitramfs_jDe2k2//usr/lib/dhcpcd/dhcpcd-hooks/30-hostname ]
+ mkdir -p /var/tmp/mkinitramfs_jDe2k2//usr/lib/dhcpcd/dhcpcd-hooks
+ [ -h /usr/lib/dhcpcd/dhcpcd-hooks/30-hostname ]
+ [ n = y ]
+ cp -pP /usr/lib/dhcpcd/dhcpcd-hooks/30-hostname /var/tmp/mkinitramfs_jDe2k2//usr/lib/dhcpcd/dhcpcd-hooks/30-hostname
+ copy_file config /usr/share/initramfs-tools/dhcpcd-hooks/70-net-conf /usr/lib/dhcpcd/dhcpcd-hooks/70-net-conf
+ local type src target link_target
+ type=config
+ src=/usr/share/initramfs-tools/dhcpcd-hooks/70-net-conf
+ target=/usr/lib/dhcpcd/dhcpcd-hooks/70-net-conf
+ [ -f /usr/share/initramfs-tools/dhcpcd-hooks/70-net-conf ]
+ [ -d /var/tmp/mkinitramfs_jDe2k2//usr/lib/dhcpcd/dhcpcd-hooks/70-net-conf ]
+ [ -e /var/tmp/mkinitramfs_jDe2k2//usr/lib/dhcpcd/dhcpcd-hooks/70-net-conf ]
+ mkdir -p /var/tmp/mkinitramfs_jDe2k2//usr/lib/dhcpcd/dhcpcd-hooks
+ [ -h /usr/share/initramfs-tools/dhcpcd-hooks/70-net-conf ]
+ [ n = y ]
+ cp -pP /usr/share/initramfs-tools/dhcpcd-hooks/70-net-conf /var/tmp/mkinitramfs_jDe2k2//usr/lib/dhcpcd/dhcpcd-hooks/70-net-conf
+ mkdir -p /var/tmp/mkinitramfs_jDe2k2/var/lib/dhcpcd
+ mkdir -p /var/tmp/mkinitramfs_jDe2k2/etc
+ cat
+ [ -f /lib/NetworkManager/libc.so.? ]
+ [ -f /lib/NetworkManager/libc.so.? ]
+ [ -f /lib/X11/libc.so.? ]
+ [ -f /lib/X11/libc.so.? ]
+ [ -f /lib/apg/libc.so.? ]
+ [ -f /lib/apg/libc.so.? ]
+ [ -f /lib/apparmor/libc.so.? ]
+ [ -f /lib/apparmor/libc.so.? ]
+ [ -f /lib/apt/libc.so.? ]
+ [ -f /lib/apt/libc.so.? ]
+ [ -f /lib/aspell/libc.so.? ]
+ [ -f /lib/aspell/libc.so.? ]
+ [ -f /lib/atril/libc.so.? ]
+ [ -f /lib/atril/libc.so.? ]
+ [ -f /lib/bfd-plugins/libc.so.? ]
+ [ -f /lib/bfd-plugins/libc.so.? ]
+ [ -f /lib/binfmt.d/libc.so.? ]
+ [ -f /lib/binfmt.d/libc.so.? ]
+ [ -f /lib/blt2.5/libc.so.? ]
+ [ -f /lib/blt2.5/libc.so.? ]
+ [ -f /lib/bluetooth/libc.so.? ]
+ [ -f /lib/bluetooth/libc.so.? ]
+ [ -f /lib/brltty/libc.so.? ]
+ [ -f /lib/brltty/libc.so.? ]
+ [ -f /lib/calibre/libc.so.? ]
+ [ -f /lib/calibre/libc.so.? ]
+ [ -f /lib/chromium-browser/libc.so.? ]
+ [ -f /lib/chromium-browser/libc.so.? ]
+ [ -f /lib/cmake/libc.so.? ]
+ [ -f /lib/cmake/libc.so.? ]
+ [ -f /lib/cnf-update-db/libc.so.? ]
+ [ -f /lib/cnf-update-db/libc.so.? ]
+ [ -f /lib/command-not-found/libc.so.? ]
+ [ -f /lib/command-not-found/libc.so.? ]
+ [ -f /lib/compat-ld/libc.so.? ]
+ [ -f /lib/compat-ld/libc.so.? ]
+ [ -f /lib/console-setup/libc.so.? ]
+ [ -f /lib/console-setup/libc.so.? ]
+ [ -f /lib/cpp/libc.so.? ]
+ [ -f /lib/cpp/libc.so.? ]
+ [ -f /lib/cryptsetup/libc.so.? ]
+ [ -f /lib/cryptsetup/libc.so.? ]
+ [ -f /lib/cups/libc.so.? ]
+ [ -f /lib/cups/libc.so.? ]
+ [ -f /lib/dbus-1.0/libc.so.? ]
+ [ -f /lib/dbus-1.0/libc.so.? ]
+ [ -f /lib/debug/libc.so.? ]
+ [ -f /lib/debug/libc.so.? ]
+ [ -f /lib/dhcpcd/libc.so.? ]
+ [ -f /lib/dhcpcd/libc.so.? ]
+ [ -f /lib/dkms/libc.so.? ]
+ [ -f /lib/dkms/libc.so.? ]
+ [ -f /lib/dpkg/libc.so.? ]
+ [ -f /lib/dpkg/libc.so.? ]
+ [ -f /lib/elogind/libc.so.? ]
+ [ -f /lib/elogind/libc.so.? ]
+ [ -f /lib/emacsen-common/libc.so.? ]
+ [ -f /lib/emacsen-common/libc.so.? ]
+ [ -f /lib/engrampa/libc.so.? ]
+ [ -f /lib/engrampa/libc.so.? ]
+ [ -f /lib/environment.d/libc.so.? ]
+ [ -f /lib/environment.d/libc.so.? ]
+ [ -f /lib/evolution/libc.so.? ]
+ [ -f /lib/evolution/libc.so.? ]
+ [ -f /lib/evolution-data-server/libc.so.? ]
+ [ -f /lib/evolution-data-server/libc.so.? ]
+ [ -f /lib/file/libc.so.? ]
+ [ -f /lib/file/libc.so.? ]
+ [ -f /lib/finalrd/libc.so.? ]
+ [ -f /lib/finalrd/libc.so.? ]
+ [ -f /lib/firefox/libc.so.? ]
+ [ -f /lib/firefox/libc.so.? ]
+ [ -f /lib/firewalld/libc.so.? ]
+ [ -f /lib/firewalld/libc.so.? ]
+ [ -f /lib/firmware/libc.so.? ]
+ [ -f /lib/firmware/libc.so.? ]
+ [ -f /lib/gcc/libc.so.? ]
+ [ -f /lib/gcc/libc.so.? ]
+ [ -f /lib/gimp/libc.so.? ]
+ [ -f /lib/gimp/libc.so.? ]
+ [ -f /lib/girepository-1.0/libc.so.? ]
+ [ -f /lib/girepository-1.0/libc.so.? ]
+ [ -f /lib/gnome-session/libc.so.? ]
+ [ -f /lib/gnome-session/libc.so.? ]
+ [ -f /lib/gnome-settings-daemon-3.0/libc.so.? ]
+ [ -f /lib/gnome-settings-daemon-3.0/libc.so.? ]
+ [ -f /lib/gnome-settings-daemon-44/libc.so.? ]
+ [ -f /lib/gnome-settings-daemon-44/libc.so.? ]
+ [ -f /lib/gnome-shell/libc.so.? ]
+ [ -f /lib/gnome-shell/libc.so.? ]
+ [ -f /lib/gnome-tweak-tool/libc.so.? ]
+ [ -f /lib/gnome-tweak-tool/libc.so.? ]
+ [ -f /lib/gnupg/libc.so.? ]
+ [ -f /lib/gnupg/libc.so.? ]
+ [ -f /lib/gnupg2/libc.so.? ]
+ [ -f /lib/gnupg2/libc.so.? ]
+ [ -f /lib/gold-ld/libc.so.? ]
+ [ -f /lib/gold-ld/libc.so.? ]
+ [ -f /lib/gpm/libc.so.? ]
+ [ -f /lib/gpm/libc.so.? ]
+ [ -f /lib/groff/libc.so.? ]
+ [ -f /lib/groff/libc.so.? ]
+ [ -f /lib/grub/libc.so.? ]
+ [ -f /lib/grub/libc.so.? ]
+ [ -f /lib/gvfs/libc.so.? ]
+ [ -f /lib/gvfs/libc.so.? ]
+ [ -f /lib/hdparm/libc.so.? ]
+ [ -f /lib/hdparm/libc.so.? ]
+ [ -f /lib/i386-linux-gnu/libc.so.6 ]
+ break
+ [ -f /lib/i386-linux-gnu/libc.so.6 ]
+ libdir=/lib/i386-linux-gnu
+ break
+ [ -z /lib/i386-linux-gnu ]
+ copy_exec /usr//lib/i386-linux-gnu/dhcpcd/dev/udev.so
+ local src target x nonoptlib ret
+ src=/usr//lib/i386-linux-gnu/dhcpcd/dev/udev.so
+ target=/usr//lib/i386-linux-gnu/dhcpcd/dev/udev.so
+ copy_file binary /usr//lib/i386-linux-gnu/dhcpcd/dev/udev.so /usr//lib/i386-linux-gnu/dhcpcd/dev/udev.so
+ local type src target link_target
+ type=binary
+ src=/usr//lib/i386-linux-gnu/dhcpcd/dev/udev.so
+ target=/usr//lib/i386-linux-gnu/dhcpcd/dev/udev.so
+ [ -f /usr//lib/i386-linux-gnu/dhcpcd/dev/udev.so ]
+ return 2
+ return 1
E: /usr/share/initramfs-tools/hooks/dhcpcd failed with return 1.
update-initramfs: failed for /boot/initrd.img-6.3.0-7-generic with 1.