[Bug 1829735] [NEW] Fresh install of 18.10 stuck at initializing ramdisk after sudo apt upgrade

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**Specs**
- Asus Zenbook 14 UX433FN (NVMe PCIe SSD)
- Ubuntu 18.10 and Windows 10 dual boot, Windows 10 working fine.

**Background**
After successful FRESH install of Ubuntu 18.10 desktop using LiveUSB, and subsequent update using either command prompt (sudo apt upgrade) or via the GUI that appears after first reboot (security updates etc.)

**How to reproduce the bug**
1. Fresh (minimal) install of Ubuntu 18.10
2. Reboot successfully.
3. Either:
  3a. Open terminal and run 
  $ sudo apt upgrade
  3b. Wait for Ubuntu to automatically show the GUI prompt asking for installation of important updates (eg. security)
4. Update successful
5. Reboot
6. Boot stuck at `Loading initial ramdisk...`, even in recovery mode.

**Suspected problem**
Broken package. Note that minimal installation is used.


More information in the AskUbuntu Forum: https://askubuntu.com/questions/1144688/ubuntu-18-10-stuck-at-initialising-ramdisk-after-fresh-install-and-subsequent-up

** Affects: apt (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: cosmic upgrade-software-version
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Fresh install of 18.10 stuck at initializing ramdisk after sudo apt upgrade
https://bugs.launchpad.net/bugs/1829735
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