Comment 51 for bug 1755863

@Guillermo, i have the same issue with ubuntu 19.04 daily (pending) from 2019-02-14
(without using the workaround) when pxe booting.
/var/log/syslog shows the folowing lines, when i serch for resolv:
```
Feb 14 17:53:27 ubuntu systemd[1]: Starting Restore /etc/resolv.conf if the system crashed before the ppp link was shut down...
Feb 14 17:53:27 ubuntu systemd[1]: Started Restore /etc/resolv.conf if the system crashed before the ppp link was shut down.
Feb 14 17:53:27 ubuntu avahi-daemon[1225]: Failed to open /etc/resolv.conf: Invalid argument
Feb 14 17:53:27 ubuntu kernel: [ 6.498832] Key type dns_resolver registered
Feb 14 17:53:27 ubuntu kernel: [ 6.985154] ACPI BIOS Error (bug): Could not resolve [\_SB.PCI0.SAT0.SPT0._GTF.DSSP], AE_NOT_FOUND (20180810/psargs-330)
Feb 14 17:53:27 ubuntu kernel: [ 6.985719] ACPI BIOS Error (bug): Could not resolve [\_SB.PCI0.SAT0.SPT0._GTF.DSSP], AE_NOT_FOUND (20180810/psargs-330)
Feb 14 17:53:27 ubuntu kernel: [ 6.986106] ACPI BIOS Error (bug): Could not resolve [\_SB.PCI0.SAT0.SPT2._GTF.DSSP], AE_NOT_FOUND (20180810/psargs-330)
Feb 14 17:53:27 ubuntu kernel: [ 6.988112] ACPI BIOS Error (bug): Could not resolve [\_SB.PCI0.SAT0.SPT2._GTF.DSSP], AE_NOT_FOUND (20180810/psargs-330)
Feb 14 17:53:27 ubuntu kernel: [ 7.347354] ACPI BIOS Error (bug): Could not resolve [\_SB.PCI0.SAT0.SPT4._GTF.DSSP], AE_NOT_FOUND (20180810/psargs-330)
Feb 14 17:53:27 ubuntu kernel: [ 7.357711] ACPI BIOS Error (bug): Could not resolve [\_SB.PCI0.SAT0.SPT4._GTF.DSSP], AE_NOT_FOUND (20180810/psargs-330)
Feb 14 17:53:28 ubuntu sh[1400]: grep: /etc/resolv.conf: No such file or directory
Feb 14 17:53:29 ubuntu systemd-resolved[1604]: Positive Trust Anchors:
Feb 14 17:53:29 ubuntu systemd-resolved[1604]: . IN DS 19036 8 2 ...
Feb 14 17:53:29 ubuntu systemd-resolved[1604]: . IN DS 20326 8 2 ...
Feb 14 17:53:29 ubuntu systemd-resolved[1604]: Negative trust anchors: 10.in-addr.arpa 16.172.in-addr.arpa 17.172.in-addr.arpa 18.172.in-addr.arpa 19.172.in-addr.arpa 20.172.in-addr.arpa 21.172.in-addr.arpa 22.172.in-addr.arpa 23.172.in-addr.arpa 24.172.in-addr.arpa 25.172.in-addr.arpa 26.172.in-addr.arpa 27.172.in-addr.arpa 28.172.in-addr.arpa 29.172.in-addr.arpa 30.172.in-addr.arpa 31.172.in-addr.arpa 168.192.in-addr.arpa d.f.ip6.arpa corp home internal intranet lan local private test
Feb 14 17:53:29 ubuntu systemd-resolved[1604]: Using system hostname 'ubuntu'.
Feb 14 17:53:29 ubuntu systemd-resolved[1604]: Server returned error NXDOMAIN, mitigating potential DNS violation DVE-2018-0001, retrying transaction with reduced feature level UDP.
Feb 14 17:53:30 ubuntu NetworkManager[1405]: <info> [1550166810.1729] Read config: /etc/NetworkManager/NetworkManager.conf (lib: 10-dns-resolved.conf, 10-globally-managed-devices.conf, 20-connectivity-ubuntu.conf, no-mac-addr-change.conf) (run: netplan.conf) (etc: default-wifi-powersave-on.conf)
Feb 14 17:53:30 ubuntu NetworkManager[1405]: <info> [1550166810.4138] dns-mgr[0x55dc42397170]: init: dns=systemd-resolved rc-manager=symlink, plugin=systemd-resolved
Feb 14 17:54:29 ubuntu systemd-resolved[1604]: Using degraded feature set (UDP) for DNS server 192.168.0.1.
```

PS: long time ago i opened a report for that, but never got any reaction there...
https://bugs.launchpad.net/ubuntu/+source/casper/+bug/1765765