Hello

So i do the udpate like this
1)    http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.7-rc2-yakkety/
2a) http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.7-rc2-yakkety/linux-headers-4.7.0-040700rc2-generic_4.7.0-040700rc2.201606051831_amd64.deb
2b) http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.7-rc2-yakkety/linux-headers-4.7.0-040700rc2-generic_4.7.0-040700rc2.201606051831_i386.deb
2c) http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.7-rc2-yakkety/linux-headers-4.7.0-040700rc2_4.7.0-040700rc2.201606051831_all.deb
2d) http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.7-rc2-yakkety/linux-image-4.7.0-040700rc2-generic_4.7.0-040700rc2.201606051831_amd64.deb
2e) http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.7-rc2-yakkety/linux-image-4.7.0-040700rc2-lowlatency_4.7.0-040700rc2.201606051831_amd64.deb  
3) u1604@u1604:~/Téléchargements$ ls -l
-rwxrwxrwx 1 root root  9964354 juin   7 18:57 linux-headers-4.7.0-040700rc2_4.7.0-040700rc2.201606051831_all.deb
-rwxrwxrwx 1 root root  1072436 juin   7 18:42 linux-headers-4.7.0-040700rc2-generic_4.7.0-040700rc2.201606051831_amd64.deb
-rwxrwxrwx 1 root root  1073438 juin   7 18:43 linux-headers-4.7.0-040700rc2-lowlatency_4.7.0-040700rc2.201606051831_amd64.deb
-rwxrwxrwx 1 root root 57911030 juin   7 19:52 linux-image-4.7.0-040700rc2-generic_4.7.0-040700rc2.201606051831_amd64.deb
-rwxrwxrwx 1 root root 57881694 juin   7 19:53 linux-image-4.7.0-040700rc2-lowlatency_4.7.0-040700rc2.201606051831_amd64.deb
u1604@u1604:~/Téléchargements$ 
4) sudo dpkg -i *.deb
5) u1604@u1604:~/Téléchargements$ dpkg -l | awk '/ +linux/ && /headers|generic/{ if(match($2,/([0-9]\.)+/)) {print $2} }'|sort -t- -rV -k3,4|paste -d" " - 
linux-signed-image-4.4.0-22-generic
linux-image-extra-4.4.0-22-generic
linux-image-extra-4.4.0-21-generic
linux-image-4.7.0-040700rc2-generic
linux-headers-4.7.0-040700rc2-lowlatency
linux-headers-4.7.0-040700rc2-generic
linux-headers-4.7.0-040700rc2
linux-image-4.4.0-22-generic
linux-headers-4.4.0-22-generic
linux-headers-4.4.0-22
linux-image-4.4.0-21-generic
linux-headers-4.4.0-21-generic
linux-headers-4.4.0-21
6)         Some extract of/boot/grub/grub.cfg    and result from boot with the selectect line.


menuentry 'Ubuntu' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-simple-8c03b7c6-407a-486b-9782-a2ae50232112' {
====>   Same problem.

submenu 'Options avancées pour Ubuntu' $menuentry_id_option 'gnulinux-advanced-8c03b7c6-407a-486b-9782-a2ae50232112' {
	menuentry 'Ubuntu, avec Linux 4.7.0-040700rc2-lowlatency' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-4.7.0-040700rc2-lowlatency-advanced-8c03b7c6-407a-486b-9782-a2ae50232112' {
====>   Same problem.		

	menuentry 'Ubuntu, with Linux 4.7.0-040700rc2-lowlatency (upstart)' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-4.7.0-040700rc2-lowlatency-init-upstart-8c03b7c6-407a-486b-9782-a2ae50232112' {
=====> In the paste i don't use this entry.  So, today it is the first time...
                         I enter my name (u1604) and my password (a) but process loop with this question.

	menuentry 'Ubuntu, with Linux 4.7.0-040700rc2-lowlatency (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-4.7.0-040700rc2-lowlatency-recovery-8c03b7c6-407a-486b-9782-a2ae50232112' {
=====>       I choose "root" but  no entry found for "sdb" in the dmesg  trace.

	menuentry 'Ubuntu, avec Linux 4.7.0-040700rc2-generic' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-4.7.0-040700rc2-generic-advanced-8c03b7c6-407a-486b-9782-a2ae50232112' {
=====>   no entry found for "sdb" in the dmesg  trace.
              
	menuentry 'Ubuntu, with Linux 4.7.0-040700rc2-generic (upstart)' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-4.7.0-040700rc2-generic-init-upstart-8c03b7c6-407a-486b-9782-a2ae50232112' {
===>   See above

	menuentry 'Ubuntu, with Linux 4.7.0-040700rc2-generic (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-4.7.0-040700rc2-generic-recovery-8c03b7c6-407a-486b-9782-a2ae50232112' {
		recordfail
===> See above

	menuentry 'Ubuntu, avec Linux 4.4.0-22-generic' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-4.4.0-22-generic-advanced-8c03b7c6-407a-486b-9782-a2ae50232112' {
======> etc......