System: OS: Peppermint 10 Ten i686 Kernel: 5.4.0-67-generic Problems: 1) Boot up "computer monitor@display was powered off"..., i do not know why,... Have to MANUALLY choose "RECOVERY MODE" (every boots) to access Peppermint to login (as usual).. 2) I just want to upgrade my Peppermint....but...errors ******************* eddielim78@eddielim78-ThinkCentre-A52 ~ $ LC_ALL=C sudo apt-get upgrade Reading package lists... Done Building dependency tree Reading state information... Done Calculating upgrade... Done 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded. 1 not fully installed or removed. After this operation, 0 B of additional disk space will be used. Do you want to continue? [Y/n] y Setting up linux-image-5.4.0-70-generic (5.4.0-70.78~18.04.1) ... Processing triggers for linux-image-5.4.0-70-generic (5.4.0-70.78~18.04.1) ... /etc/kernel/postinst.d/dkms: * dkms: running auto installation service for kernel 5.4.0-70-generic ...done. /etc/kernel/postinst.d/initramfs-tools: update-initramfs: Generating /boot/initrd.img-5.4.0-70-generic I: The initramfs will attempt to resume from /dev/sdb2 I: (UUID=b9087aef-1d3d-4224-8370-b2b7de9cf5e6) I: Set the RESUME variable to override this. /etc/kernel/postinst.d/zz-update-grub: Sourcing file `/etc/default/grub' /usr/sbin/grub-mkconfig: 40: /etc/default/grub: Syntax error: Unterminated quoted string run-parts: /etc/kernel/postinst.d/zz-update-grub exited with return code 2 dpkg: error processing package linux-image-5.4.0-70-generic (--configure): installed linux-image-5.4.0-70-generic package post-installation script subprocess returned error exit status 1 Errors were encountered while processing: linux-image-5.4.0-70-generic E: Sub-process /usr/bin/dpkg returned an error code (1) ************************ My Peppermint "grub.d", appended herewith: https://drive.google.com/drive/folders/1uTcfx5wj7sWdtFFYYK6aYHg5O88KF-8p?usp=sharing for your checking, tq.. Tqs for replying (with helpful guidance).... ************************