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I've Googled around and found three GUI methods to configure L2TP/IPsec VPN (the last of which is not a NM plugin, but a standalone program):

I'd have preferred to use this even if it's been declared unmaintaned on it's GitHub page, but the only way to use specify the PSK is by specifying some group. Nothing of that sort was configured on the VPN server.

No PSK option at all, insists on certificates as noted by this question as well.

It allowed me to specify the only three things I need to connect to my VPN, but it always fails due to some mysterious Error 500. The only way to look at the connection log is my clicking the notification. But of course, we can't do that on Ubuntu.

The VPN service is served by SoftEther VPN. I've enabled L2TP/IPsec protocols on it, and my friend successfully connected to it using his iPhone, Macbook and a Windows 10 machine with just those three things: username, password and the pre-shared key. How do I do the same on Ubuntu?

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Oxwivi
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  • in network-manager-l2tp the group is the leftid in the secrets file, if left blank it defaults to %any. Networ-manager-strongswan has no l2tp support whatsoever. –  Oct 06 '15 at 09:43
  • If I use %any as Group Name on the network-manager-l2tp itself, can I expect it to connect? – Oxwivi Oct 06 '15 at 09:54
  • try leaving both gateway id and group name blank. –  Oct 06 '15 at 11:11
  • @adonis It automatically defaults to whatever it's written there if I leave it empty. – Oxwivi Oct 06 '15 at 13:10

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