I started using this version of the Ubuntu image, it supports OpenVPN very well. After upgrading the OS using “apt upgrade”, I can’t use OpenVPN and got an error like “openvpn–ERROR: Cannot open TUN/TAP dev /dev/net/tun: No such file or directory (errno=2)”.
I noticed that the updated OS’s kernel doesn’t have the builtin module /kernel/drivers/net/tun.ko, but the old one has.
Is there any reason for moving this module in the new upgrade, and whether openvpn can be re-supported in subsequent upgrades? @Frank @numbqq