Create pptp connection on Endless os

[Hamed_Moradi]

I want to create the pptp connection on my Endless os but only the openvpn and cisco anyconnect is available.
I tried to install network manager but i got the below error message
root@endless:~# network-manager-openvpn-gnome
-bash: network-manager-openvpn-gnome: command not found
root@endless:~# sudo apt install network-manager-openvpn-gnome
Reading package lists… Done
Building dependency tree… Done
network-manager-openvpn-gnome is already the newest version (1.8.10-1bem3).
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
W: Not using locking for read only lock file /var/lib/dpkg/lock-frontend
W: Not using locking for read only lock file /var/lib/dpkg/lock
root@endless:~#
root@endless:~#

please help me.
Thank you.

[LeandroStanger]

@Hamed_Moradi

root@endless:~# sudo apt install network-manager-openvpn-gnome

The Endless OS is only compatible with Flatpak Applications.
https://support.endlessm.com/hc/en-us/articles/115004795106--O-Endless-OS-é-baseado-em-Debian-
https://support.endlessm.com/hc/en-us/articles/115000097483-Por-que-não-consigo-usar-comandos-apt-get-dpkg-dnf-ou-rpm-

[Byron_Diaz]

Hi!

What’s Flatpak?
Can I install and add new software or apps?

[Hamed_Moradi]

Thank you for your attention.
But i want to have a pptp connection on Endless.
As you know there is just two connection type are available.
What should i do ?