actualizar trisquel en usb bota error del kernel y luego no arranca

trisquel@trisquel:~/Desktop$ sudo aptitude upgrade
Se configurarán los siguientes paquetes que están ahora parcialmente instalados:
linux-image-2.6.35-28-generic
No se instalará, actualizará o eliminará ningún paquete.
0 paquetes actualizados, 0 nuevos instalados, 0 para eliminar y 0 sin actualizar.
Necesito descargar 0B de archivos. Después de desempaquetar se usarán 0B.
Configurando linux-image-2.6.35-28-generic (2.6.35-28.50trisquel1) ...
Running depmod.
update-initramfs: Generating /boot/initrd.img-2.6.35-28-generic
Not updating initrd symbolic links since we are being updated/reinstalled
(2.6.35-28.49trisquel1 was configured last, according to dpkg)
Not updating image symbolic links since we are being updated/reinstalled
(2.6.35-28.49trisquel1 was configured last, according to dpkg)
Examining /etc/kernel/postinst.d.
run-parts: executing /etc/kernel/postinst.d/initramfs-tools 2.6.35-28-generic /boot/vmlinuz-2.6.35-28-generic
run-parts: executing /etc/kernel/postinst.d/pm-utils 2.6.35-28-generic /boot/vmlinuz-2.6.35-28-generic
run-parts: executing /etc/kernel/postinst.d/update-notifier 2.6.35-28-generic /boot/vmlinuz-2.6.35-28-generic
run-parts: executing /etc/kernel/postinst.d/zz-update-grub 2.6.35-28-generic /boot/vmlinuz-2.6.35-28-generic
/usr/sbin/grub-probe: error: cannot find a device for / (is /dev mounted?).
run-parts: /etc/kernel/postinst.d/zz-update-grub exited with return code 1
Failed to process /etc/kernel/postinst.d at /var/lib/dpkg/info/linux-image-2.6.35-28-generic.postinst line 1010.
dpkg: error al procesar linux-image-2.6.35-28-generic (--configure):
el subproceso script post-installation instalado devolvió el código de salida de error 2
Se encontraron errores al procesar:
linux-image-2.6.35-28-generic
E: Sub-process /usr/bin/dpkg returned an error code (1)
Un paquete no se pudo instalar. Intentado recuperarse:
Configurando linux-image-2.6.35-28-generic (2.6.35-28.50trisquel1) ...
Running depmod.
update-initramfs: Generating /boot/initrd.img-2.6.35-28-generic
Not updating initrd symbolic links since we are being updated/reinstalled
(2.6.35-28.49trisquel1 was configured last, according to dpkg)
Not updating image symbolic links since we are being updated/reinstalled
(2.6.35-28.49trisquel1 was configured last, according to dpkg)
Examining /etc/kernel/postinst.d.
run-parts: executing /etc/kernel/postinst.d/initramfs-tools 2.6.35-28-generic /boot/vmlinuz-2.6.35-28-generic
run-parts: executing /etc/kernel/postinst.d/pm-utils 2.6.35-28-generic /boot/vmlinuz-2.6.35-28-generic
run-parts: executing /etc/kernel/postinst.d/update-notifier 2.6.35-28-generic /boot/vmlinuz-2.6.35-28-generic
run-parts: executing /etc/kernel/postinst.d/zz-update-grub 2.6.35-28-generic /boot/vmlinuz-2.6.35-28-generic
/usr/sbin/grub-probe: error: cannot find a device for / (is /dev mounted?).
run-parts: /etc/kernel/postinst.d/zz-update-grub exited with return code 1
Failed to process /etc/kernel/postinst.d at /var/lib/dpkg/info/linux-image-2.6.35-28-generic.postinst line 1010.
dpkg: error al procesar linux-image-2.6.35-28-generic (--configure):
el subproceso script post-installation instalado devolvió el código de salida de error 2
Se encontraron errores al procesar:
linux-image-2.6.35-28-generic

trisquel@trisquel:~/Desktop$