I can confirm the issue is the following line in /etc/ppp/ip- up.d/0000usepeerdns as previously mentioned :
cp -a "$REALRESOLVCONF" "$REALRESOLVCONF.pppd-backup.$PPP_IFACE" The variable expansion of that line is : cp -a /run/systemd/resolve/stub-resolv.conf /run/systemd/resolve/stub-resolv.conf.pppd-backup.ppp0 I had to modify the shebang line of that script from : #!/bin/sh -e to : #!/bin/sh to get past that line and output debugging output I inserted, which included : ls -l /run/systemd/resolve/stub-resolv.conf -rw-r--r-- 1 systemd-resolve systemd-resolve 720 Jan 17 21:47 /run/systemd/resolve/stub-resolv.conf ls -l /run/systemd/resolve/stub-resolv.conf.pppd-backup.ppp0 -rw------- 1 root root 720 Jan 17 21:47 /run/systemd/resolve/stub-resolv.conf.pppd-backup.ppp0 So 'cp -a' isn't copying the permissions. Oddly, $? is 0 after running that 'cp -a' line, therefor seems correct, also umask is 0022, so I'm not sure what is going wrong. Anyway a fix seems to be to change the following line in /etc/ppp/ip-up.d/0000usepeerdns from : cp -a "$REALRESOLVCONF" "$REALRESOLVCONF.pppd-backup.$PPP_IFACE" to: cp "$REALRESOLVCONF" "$REALRESOLVCONF.pppd-backup.$PPP_IFACE" chmod 644 "$REALRESOLVCONF.pppd-backup.$PPP_IFACE" For Ubuntu 18.04 setups that have the pppconfig package installed, the following lines in /etc/ppp/ip-up.d/0dns-up probably should be changed from : /bin/cp -Lp "$RESOLVCONF" "$RESOLVBAK" || exit 1 /bin/cp -Lp "$TEMPRESOLV" "$RESOLVCONF" || exit 1 chmod 644 "$RESOLVCONF" || exit 1 to: /bin/cp -Lp "$RESOLVCONF" "$RESOLVBAK" || exit 1 chmod 644 "$RESOLVBAK" || exit 1 /bin/cp -Lp "$TEMPRESOLV" "$RESOLVCONF" || exit 1 chmod 644 "$RESOLVCONF" || exit 1 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1778946 Title: No dns resolution after closing a vpn/pptp connection To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/1778946/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
