How to install xvfb and / or how to enable the package verification on Ubuntu 23.10

[Mario Marietto]

Hello.

I have two problems to fix :

1) how to install xvfb on Ubuntu 23.10
2) how to enable the verification when I install the packages. You will
understand everything reading below :

root at marietto:/home/mario# lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 23.10
Release:        23.10
Codename:       mantic

root at marietto:/home/mario# apt install xvfb

Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
The following NEW packages will be installed:
 xvfb
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need to get 869 kB of archives.
After this operation, 2211 kB of additional disk space will be used.
WARNING: The following packages cannot be authenticated!
 xvfb
Install these packages without verification? [y/N] y

Ign:1 http://security.ubuntu.com/ubuntu mantic-security/universe amd64 xvfb
amd64 2:21.1.7-3ubuntu2.4

Err:1 http://archive.ubuntu.com/ubuntu mantic-security/universe amd64 xvfb
amd64 2:21.1.7-3ubuntu2.4
404  Not Found [IP: 91.189.91.83 80]

E: Failed to fetch
http://archive.ubuntu.com/ubuntu/pool/universe/x/xorg-server/xvfb_21.1.7-3ubuntu2
.4_amd64.deb
404  Not Found [IP: 91.189.91.83 80]

E: Unable to fetch some archives, maybe run apt-get update or try with
--fix-missing?

thanks.

-- 
Mario.
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