[Bug 1779757] [NEW] Ubuntu 18.04 installer failure related time synchronization issues on a DELL server

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Tried to install Ubuntu server on an older Dell server, but it failed. I
received the exact same errors that was posted in another thread (and I
don't have a way to copy the failure log) so I am copying the details
from https://answers.launchpad.net/ubuntu/+question/669976.

As in the other thread, there seemed to be a time synchronization issue:

"E: Release file for http://.../InRelease is not valid yet (invalid for
another 1h 59min 50s)."

However, I checked the BIOS system time - it was correct. This seems
like an installer bug in 18.04 LTS. I just installed 16.04.4 without
issue, and will upgrade from there.

If I had to guess where this error is coming from, I would guess that it
is related to the fact that this DELL machine encodes system time as
packed BCE and the 18.04 LTS  Ubuntu installer is decoding it as
something else? But that is just my guess


- - - - - - - - 
here are additional error details (copied from +question/669976.) 

- got a python traceback from curthooks.py, which seems to be called by unshare.
- highlights:

Unexpected error while running command: unshare --fork --pid -- chroot
/target apt-get --quiet --option=Acquire::Languages=none
--option=Dir::Etc::sourcelist=/tmp/tmpk_vnogkp/sources.list
--option=Dir::Etc::sourceparts=/tmp/tmpk_vnogkp/sources.list.d update

Exit code: 100

finish: cmd-install: FAIL: curtin command install

Traceback:
  File "/usr/lib/python3/dist-packages/curtin/commands/curthooks.py", line 191, in install_kernel
    map_suffix = mapping[codename][version]
KeyError: 'bionic'

** Affects: subiquity (Ubuntu)
     Importance: Undecided
         Status: Confirmed

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Ubuntu 18.04 installer failure related time synchronization issues on a DELL server
https://bugs.launchpad.net/bugs/1779757
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