Po-Hsu Lin, thank you for reporting this and helping make Ubuntu better.
As per http://www.dell.com/support/home/us/en/19/product-
support/product/vostro-14-3458-laptop/drivers an update to your
computer's buggy and outdated BIOS is available (A01). If you update to
this following https://help.ubuntu.com/community/BIOSUpdate does it
change anything?
If it doesn't, could you please both specify what happened, and provide the
output of the following terminal command:
sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date
Once the BIOS is updated, and the information above is provided, then
please mark this report Status Confirmed.
Thank you for your understanding.
** Tags added: bios-outdated-a01
** Changed in: linux (Ubuntu)
Importance: Undecided => Low
** Changed in: linux (Ubuntu)
Status: Confirmed => Incomplete
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https://bugs.launchpad.net/bugs/1465108
Title:
[Dell Vostro 3458] System will start blinking after switch to virtual
terminal
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