尽管我按照官方网站上的说明操作，但我还是无法在 Ubuntu 18.04 上安装 VPN unlimited（这些说明相当过时，因为它们适用于 Ubuntu 14.04）。我目前陷入困境，因为我收到以下消息：
user $ sudo dpkg -i vpn-unlimited_4.22-amd64_001_release_STANDALONE.deb
Selecting previously unselected package vpn-unlimited.
(Reading database ... 216364 files and directories currently installed.)
Preparing to unpack vpn-unlimited_4.22-amd64_001_release_STANDALONE.deb ...
Unpacking vpn-unlimited (4.22) ...
dpkg: dependency problems prevent configuration of vpn-unlimited:
vpn-unlimited depends on libcurl3 (>= 7.22.0); however:
Package libcurl3 is not installed.
vpn-unlimited depends on iproute; however:
Package iproute is not installed.
dpkg: error processing package vpn-unlimited (--install):
dependency problems - leaving unconfigured
Processing triggers for systemd (237-3ubuntu10) ...
Processing triggers for ureadahead (0.100.0-20) ...
Processing triggers for hicolor-icon-theme (0.17-2) ...
Processing triggers for desktop-file-utils (0.23-1ubuntu3.18.04.1) ...
Processing triggers for gnome-menus (3.13.3-11ubuntu1) ...
Processing triggers for mime-support (3.60ubuntu1) ...
Errors were encountered while processing:
vpn-unlimited