To get the e1000e driver working, do the following steps:
Make backup
cp /usr/share/pve-manager/js/pvemanagerlib.js /usr/share/pve-manager/js/pvemanagerlib.js.dist
# add e1000e
sed -i 's/|e1000|/|e1000|e1000e|/' /usr/share/pve-manager/js/pvemanagerlib.js
sed -i "/\['e1000', 'Intel E1000'\],/a \ ['e1000e', 'Intel e1000e']," /usr/share/pve-manager/js/pvemanagerlib.js
# backup updated script
cp /usr/share/pve-manager/js/pvemanagerlib.js /usr/share/pve-manager/js/pvemanagerlib.js.e1000e
# make backup
cp /usr/share/perl5/PVE/QemuServer.pm /usr/share/perl5/PVE/QemuServer.pm.dist
# add e1000e
sed -i "s/'e1000', 'pcnet'/'e1000', 'e1000e', 'pcnet'/" /usr/share/perl5/PVE/QemuServer.pm
# backup updated script
cp /usr/share/perl5/PVE/QemuServer.pm /usr/share/perl5/PVE/QemuServer.pm.e1000e
Make changes take effect
service pveproxy restart
service pvedaemon restart