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I definitely think I've removed the virtual box perfectly. However, the following problems arise.

Hit:1 http://uk-mirrors.evowise.com/ubuntu focal InRelease
Hit:2 http://uk-mirrors.evowise.com/ubuntu focal-updates InRelease
Hit:3 http://uk-mirrors.evowise.com/ubuntu focal-backports InRelease
Hit:4 http://uk-mirrors.evowise.com/ubuntu focal-security InRelease
Hit:5 https://dl.winehq.org/wine-builds/ubuntu focal InRelease                 
Ign:6 http://download.virtualbox.org/virtualbox/debian focal InRelease         
Err:7 http://download.virtualbox.org/virtualbox/debian focal Release
  404  Not Found [IP: 104.70.236.28 80]
Reading package lists... Done
E: The repository 'http://download.virtualbox.org/virtualbox/debian focal Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.

$ sudo apt update

Even if I use the Ubuntu software update app, not the terminal, a system message of failure occurs. I tried to change to a best update server, but it also failed.

enter image description here

A similar question case has been reviewed, but no related case has been found with Virtual Box.

For reference, there are still two virtual boxes of related installation files left, but these could not be removed with the dpkg command.

Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name                     Version      Architecture Description
+++-========================-============-============-========================>
un  virtualbox-guest-dkms    <none>       <none>       (no description availabl>
un  virtualbox-guest-modules <none>       <none>       (no description availabl>
bakuiseok
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    It looks like you added arepository for VB. Try to remove the corresponding lines from /etc/apt/sources.list or the list file(s) from /etc/apt/sources.list.d. (you need to use sudo to edit files there) – dadexix86 May 03 '20 at 13:36
  • @dadexix86 The update problem is resolved because of you, Thanks. Could you tell me a little more about remove the dpkg(dkms) list on question? – bakuiseok May 03 '20 at 13:46
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    They should already be removed, as you can see in the first column un = uninstalled. To double check this, you can use apt policy virtualbox-guest-dkms virtualbox-guest-modules – dadexix86 May 03 '20 at 13:48
  • @dadexix86 But, why they'd viewing on dpkg list? – bakuiseok May 03 '20 at 13:52
  • Since you did not post the command that you tiped, I cannot answer this question, sorry... It can be a lot of causes depending on what you asked the system for. – dadexix86 May 03 '20 at 13:55
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    Does this answer your question? What can I do if a repository/PPA does not have a Release file?. If you try pointing your web browser at that repository (http://download.virtualbox.org/virtualbox/debian/dists/) you will see that 'focal' is not listed, hence the 404 error. – user535733 May 03 '20 at 14:10

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