I have a new install of Debian Buster, I downloaded the ProtonVPN CLI package and went to install and got the errors:
E: Unable to locate package protonvpn-stable-release_1.0.0-1_all.deb
E: Couldn't find any package by glob 'protonvpn-stable-release_1.0.0-1_all.deb'
E: Couldn't find any package by regex 'protonvpn-stable-release_1.0.0-1_all.deb'
my /etc/apt/sources.list file looks like this:
#deb cdrom:[Debian GNU/Linux 10.10.0 _Buster_ - Official amd64 NETINST 20210619-16:11]/ buster main
#deb cdrom:[Debian GNU/Linux 10.10.0 _Buster_ - Official amd64 NETINST 20210619-16:11]/ buster main
deb http://deb.debian.org/debian/ buster main
deb-src http://deb.debian.org/debian/ buster main
deb http://security.debian.org.debian-security buster/updates main
deb-src http://security.debian.org.debian-security buster/updates main
deb http://deb.debian.org/debian/ buster-updates main
deb-src http://deb.debian.org/debian/ buster main
I was able to apt-get install wget as well as update and upgrdade. I even tried uncommenting the cdrom lines at the top. I reran apt-get update and apt-get upgrade.
Still, when I try to install the ProtonVPN package I get the above errors.
Note I understand that this is not strictly programming related. If there is a more appropriate stack, please let me know in comments and I will close and post there.
To install manually downloaded Debian package, use dpkg:
dpkg -i protonvpn-stable-release_1.0.0-1_all.deb
If dpkg is complaining about missing dependencies, then use apt-get -f install after running dpkg