boot failed on ubuntu 18.04

[sadtoot]

i have an acer e5-575, which was previously running ubuntu 16.04. automatic upgrade wasn't working so i installed 18.04 through USB. booting from the USB works fine, and the installation doesn't seem to show any errors, but boot keeps showing "default boot device missing or boot failed".


http://paste.ubuntu.com/p/CHFZDYdBFz/

[westie457]

Have you tried setting 'Trust' on the new file? You almost certainly had to do that with the original installation.

[sadtoot]

i'm not sure what you're talking about. i did have trouble on my first install, but i do not remember the steps i took to fix it, just a bunch of trial and error until something worked.

[oldfred]

Acer Trust Settings - details, some now report that then secure boot has to be on to set trust:
https://ubuntuforums.org/showthread.php?t=2297947&p=13369742#post13369742
https://ubuntuforums.org/showthread.php?t=2358003
https://ubuntuforums.org/showthread.php?t=2291335&p=13341757#post13341757
https://ubuntuforums.org/showthread.php?t=2342323
Acer Cloudbook shows screen for selecting trust
http://bernaerts.dyndns.org/linux/74-ubuntu/340-ubuntu-install-acer-aspire-cloudbook-431
http://community.acer.com/t5/Predator-Laptops/Dual-Boot-Ubuntu-Win10-Step-by-step-guide/m-p/430392#U430392


You also have several obsolete UEFI entries.
Once you know which one works, you can and should delete the others.
To see entries like shown in Boot-Repair report:
sudo efibootmgr -v

The "-v" option displays all the entries so you can confirm you're deleting the right one, and then you use the combination of "-b ####" (to specify the entry) and "-B" (to delete it). Examples #5 is delete example in man page:, with Ubuntu you need sudo, others must be at root. some need all 4 hex chars, others only need significant digits
sudo efibootmgr -b XXXX -B
man efibootmgr