install ocserv in ubuntu

install_ocserv.sh

#install deps
apt-get update
apt-get install -y gnutls-bin iptables libnl-route-3-200 libseccomp2 libwrap0 openssl curl --no-install-recommends
buildDeps=" \
                autoconf \
                autogen \
                ca-certificates \
                gcc \
                gperf \
                libgnutls28-dev \
                libnl-route-3-dev \
                libpam0g-dev \
                libreadline-dev \
                libseccomp-dev \
                libwrap0-dev \
                make \
                pkg-config \
                xz-utils \
        ";
apt-get install -y $buildDeps --no-install-recommends && rm -rf /var/lib/apt/lists/*

#install lz4
LZ4_VERSION=`curl "https://github.com/Cyan4973/lz4/releases/latest" | sed -n 's/^.*tag\/\(.*\)".*/\1/p'`
curl -SL "https://github.com/Cyan4973/lz4/archive/$LZ4_VERSION.tar.gz" -o lz4.tar.gz
mkdir -p /usr/src/lz4
tar -xf lz4.tar.gz -C /usr/src/lz4 --strip-components=1
rm lz4.tar.gz
cd /usr/src/lz4
make && make install

#install ocserv
OC_VERSION=`curl "http://www.infradead.org/ocserv/download.html" | sed -n 's/^.*version is <b>\(.*$\)/\1/p'`
curl ftp://ftp.infradead.org/pub/ocserv/ocserv-$OC_VERSION.tar.xz -o ocserv.tar.xz
mkdir -p /usr/src/ocserv
tar -xf ocserv.tar.xz -C /usr/src/ocserv --strip-components=1
rm ocserv.tar.xz
cd /usr/src/ocserv
sed -i '/#define MAX_CONFIG_ENTRIES /{s/96/200/}' src/vpn.h
./configure --enable-linux-namespaces
make && make install
mkdir -p /etc/ocserv
cp /usr/src/ocserv/doc/sample.config /etc/ocserv/ocserv.conf

#clean deps
cd /
rm -fr /usr/src/lz4
rm -fr /usr/src/ocserv
apt-get purge -y --auto-remove $buildDeps

libgnutls28-dev 删除的话 会出现下面的错误。
ocserv: error while loading shared libraries: libgnutls.so.28: cannot open shared object file: No such file or directory