Issue with linux-image-5.0.0-13-generic file during installations

Forgive me because I am a very excited, albeit brand new Linux user. I started having issues with installs a couple of days ago. I also cannot do any backups. The errors I get all have to do with linux-image-5.0.0-13-generic. I’m currently on linux-image-5.0.0-21-generic.

I get the following message when trying to run sudo apt-get upgrade, which I think might be a clue to the problem:

Removing linux-image-5.0.0-13-generic (5.0.0-13.14) ... /etc/kernel/postrm.d/initramfs-tools: update-initramfs: Deleting /boot/initrd.img-5.0.0-13-generic /etc/kernel/postrm.d/zz-update-grub: Sourcing file `/etc/default/grub' /usr/sbin/grub-mkconfig: 1: /etc/default/grub: blinking: not found run-parts: /etc/kernel/postrm.d/zz-update-grub exited with return code 127 dpkg: error processing package linux-image-5.0.0-13-generic (--remove):  installed linux-image-5.0.0-13-generic package post-removal script subprocess returned error exit status 1 Errors were encountered while processing:  linux-image-5.0.0-13-generic E: Sub-process /usr/bin/dpkg returned an error code (1) 

Any help anyone can provide is greatly appreciated. I love everything I’ve learned / tried in Linux compared to Windows so far, but this is a little discouraging. Thank you in advance.