MCE hardware error cpu 0

1.0 Error

ErrorWhile running Ubuntu 18.04.1 on a laptop, the following errors were observed.
mce: hardware error cpu 0 machine check 0 bank 6 ae0000000040110a
mce: hardware error tsc 0 addr ffb07540 misc 238a0000086
mce: hardware error processor 0:40651 time 1540082330 socket 0 Apic 0 microcode 24
ipmi dmi invalid offset 0
The system would stop in the single user mode.… Read more

Failed to fetch webpage, temporary failure resolving domain

1.0 Error

While configuring a Linux server, the error Failed to fetch webpage, temporary failure resolving domain was observed.

$ sudo apt-get update
Err:1 bionic InRelease
  Temporary failure resolving ''
Err:2 bionic-updates InRelease
  Temporary failure resolving ''
Err:3 bionic-backports InRelease
  Temporary failure resolving ''
Err:4 bionic-security InRelease
  Temporary failure resolving ''
Reading package lists...
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SSL Certificate expired, site not opening


A website stopped opening in browser, giving the error that the SSL certificate was either invalid or had expired.


Checking the website with wget,

$ wget
--2018-01-14 16:58:36--
Resolving (, 2001:db8:1221:2341:f03c:f27b:12fa:2123
Connecting to (||:443...
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