i'm looking for a workaround.

retracing my steps, i try the full iso again, but i guess the fire's gone out 
of my cdburner:
$  cdrecord bionic-desktop-amd64.iso
wodim: No write mode specified.
wodim: Assuming -tao mode.
wodim: Future versions of wodim may have different drive dependent defaults.
wodim: Operation not permitted. Warning: Cannot raise RLIMIT_MEMLOCK limits.
Device was not specified. Trying to find an appropriate drive...
Looking for a DVD-R drive to store 1431.56 MiB...
Detected DVD-R drive: /dev/dvdrw
Using /dev/cdrom of unknown capabilities
Device type    : Removable CD-ROM
Version        : 5
Response Format: 2
Capabilities   :
Vendor_info    : 'TSSTcorp'
Identification : 'DVD+-RW TS-L633C'
Revision       : 'D300'
Device seems to be: Generic mmc2 DVD-R/DVD-RW.
Using generic SCSI-3/mmc DVD-R(W) driver (mmc_mdvd).
Driver flags   : SWABAUDIO BURNFREE
Supported modes: PACKET SAO
Speed set to 11080 KB/s
Starting to write CD/DVD at speed   8.0 in real unknown mode for single session.
Last chance to quit, starting real write in    0 seconds. Operation starts.
Errno: 5 (Input/output error), reserve track scsi sendcmd: no error
CDB:  53 00 00 00 00 00 0B 2F 20 00
status: 0x2 (CHECK CONDITION)
Sense Bytes: 72 05 21 04 00 00 00 0E 09 0C 00 00 00 03 00 00
Sense Key: 0x1 Recovered Error, Segment 5
Sense Code: 0x00 Qual 0x03 (setmark detected) Fru 0x0
Sense flags: Blk 67108864 (not valid) illegal block length
cmd finished after 40.725s timeout 40s
wodim: Cannot open new session.
$

well, so, that's what the mini.iso is for, right?  as an alternative
installation method.

so, but, the bionic mini.iso dhcp fails, tho manual network configuration 
works, and thus mini.iso installs a static ip configuration.  well, on my 
desktop, i want a dhcp configuration.  i figure why not just drop back to the 
simple way it was done before network manager, so, i uninstalled wpasupplicant, 
which took network manager out with it:
 Start-Date: 2018-02-20  12:41:02
 Commandline: apt-get --auto-remove purge wpasupplicant
 Purge: network-manager-pptp:amd64 (1.2.4-4), iputils-arping:amd64 
(3:20161105-1ubuntu2), pptp-linux:amd64 (1.9.0+ds-2), dnsmasq-base:amd64 
(2.78-1), network-manager-gnome:amd64 (1.8.10-2ubuntu1), network-manager :amd64 
(1.8.4-1ubuntu4), lubuntu-desktop:amd64 (0.90), lubuntu-gtk-desktop:amd64 
(0.90), wpasupplicant:amd64 (2:2.6-15ubuntu1), dns-root-data:amd64 (2018013001)
 End-Date: 2018-02-20  12:41:24

and edited /etc/network/interfaces to contain:
 auto  lo
 iface lo inet loopback
 
 auto enp0s25
 iface enp0s25 inet dhcp

and there's nothing in /etc/udev/rules.d

clearly it still needs something, it boots up like this:
$ ip a
 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group 
default qlen 1000
     link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
     inet 127.0.0.1/8 scope host lo
        valid_lft forever preferred_lft forever
     inet6 ::1/128 scope host
        valid_lft forever preferred_lft forever
 2: enp0s25: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default 
qlen 1000
     link/ether 00:21:70:32:6a:ee brd ff:ff:ff:ff:ff:ff

and i find these matches for either "eth" or "enp" in /var/log/syslog:
*Feb 20 12:44:30 op755 kernel: [    2.106086] e1000e 0000:00:19.0 eth0: (PCI 
Express:2.5GT/s:Width x1) 00:21:70:32:6a:ee
*Feb 20 12:44:30 op755 kernel: [    2.106146] e1000e 0000:00:19.0 eth0: 
Intel(R) PRO/1000 Network Connection
*Feb 20 12:44:30 op755 kernel: [    2.106207] e1000e 0000:00:19.0 eth0: MAC: 7, 
PHY: 6, PBA No: 1041FF-0FF
*Feb 20 12:44:30 op755 kernel: [    2.107682] e1000e 0000:00:19.0 enp0s25: 
renamed from eth0
*Feb 20 12:44:30 op755 kernel: [   27.061742] Bluetooth: BNEP (Ethernet 
Emulation) ver 1.3
*Feb 20 12:45:18 op755 ureadahead[231]: ureadahead:enp0s25: Ignored relative 
path
*Feb 20 12:45:18 op755 ureadahead[231]: ureadahead:enp0s25: Ignored relative 
path
*Feb 20 12:45:18 op755 ureadahead[231]: ureadahead:enp0s25: Ignored relative 
path
*Feb 20 12:57:33 op755 kernel: [    2.150044] e1000e 0000:00:19.0 eth0: (PCI 
Express:2.5GT/s:Width x1) 00:21:70:32:6a:ee
*Feb 20 12:57:33 op755 kernel: [    2.150078] e1000e 0000:00:19.0 eth0: 
Intel(R) PRO/1000 Network Connection
*Feb 20 12:57:33 op755 kernel: [    2.150125] e1000e 0000:00:19.0 eth0: MAC: 7, 
PHY: 6, PBA No: 1041FF-0FF
*Feb 20 12:57:33 op755 kernel: [    2.150968] e1000e 0000:00:19.0 enp0s25: 
renamed from eth0
*Feb 20 12:57:33 op755 kernel: [   17.469721] Bluetooth: BNEP (Ethernet 
Emulation) ver 1.3

my xenial install does have network manager, and still works fine:
$ ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group 
default qlen 1
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: enp0s25: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state 
UP group default qlen 1000
    link/ether 00:21:70:32:6a:ee brd ff:ff:ff:ff:ff:ff
    inet 192.168.0.42/24 brd 192.168.0.255 scope global dynamic enp0s25
       valid_lft 581511sec preferred_lft 581511sec
    inet6 fe80::221:70ff:fe32:6aee/64 scope link
       valid_lft forever preferred_lft forever

and i find these matches for either "eth" or "enp" in /var/log/syslog:
 /x/var/log/syslog:Feb 22 05:43:47 op755 kernel: [    1.870094] e1000e 
0000:00:19.0 eth0: (PCI Express:2.5GT/s:Width x1) 00:21:70:32:6a:ee
 /x/var/log/syslog:Feb 22 05:43:47 op755 kernel: [    1.870154] e1000e 
0000:00:19.0 eth0: Intel(R) PRO/1000 Network Connection
 /x/var/log/syslog:Feb 22 05:43:47 op755 kernel: [    1.870217] e1000e 
0000:00:19.0 eth0: MAC: 7, PHY: 6, PBA No: 1041FF-0FF
 /x/var/log/syslog:Feb 22 05:43:47 op755 kernel: [    1.871606] e1000e 
0000:00:19.0 enp0s25: renamed from eth0
 /x/var/log/syslog:Feb 22 05:43:53 op755 kernel: [   37.579393] Bluetooth: BNEP 
(Ethernet Emulation) ver 1.3
 /x/var/log/syslog:Feb 22 05:44:01 op755 NetworkManager[740]: <info>  
[1519299841.7604] devices added (path: 
/sys/devices/pci0000:00/0000:00:19.0/net/enp0s25, iface: enp0s25)
 /x/var/log/syslog:Feb 22 05:44:01 op755 NetworkManager[740]: <info>  
[1519299841.7604] device added (path: 
/sys/devices/pci0000:00/0000:00:19.0/net/enp0s25, iface: enp0s25): no ifupdown 
configuration found.
 /x/var/log/syslog:Feb 22 05:44:01 op755 NetworkManager[740]: <info>  
[1519299841.8553] Loaded device plugin: NMVethFactory (internal)
 /x/var/log/syslog:Feb 22 05:44:01 op755 NetworkManager[740]: <info>  
[1519299841.8555] Loaded device plugin: NMEthernetFactory (internal)
 /x/var/log/syslog:Feb 22 05:44:03 op755 NetworkManager[740]: <info>  
[1519299843.2271] manager: (enp0s25): new Ethernet device 
(/org/freedesktop/NetworkManager/Devices/0)
 /x/var/log/syslog:Feb 22 05:44:03 op755 NetworkManager[740]: <info>  
[1519299843.2286] device (enp0s25): state change: unmanaged -> unavailable 
(reason 'managed') [10 20 2]
 /x/var/log/syslog:Feb 22 05:44:03 op755 kernel: [   46.913832] IPv6: 
ADDRCONF(NETDEV_UP): enp0s25: link is not ready
 /x/var/log/syslog:Feb 22 05:44:03 op755 kernel: [   47.380135] IPv6: 
ADDRCONF(NETDEV_UP): enp0s25: link is not ready
 /x/var/log/syslog:Feb 22 05:44:06 op755 NetworkManager[740]: <info>  
[1519299846.7203] device (enp0s25): link connected
 /x/var/log/syslog:Feb 22 05:44:06 op755 NetworkManager[740]: <info>  
[1519299846.7206] device (enp0s25): state change: unavailable -> disconnected 
(reason 'carrier-changed') [20 30 40]
 /x/var/log/syslog:Feb 22 05:44:06 op755 NetworkManager[740]: <info>  
[1519299846.7223] device (enp0s25): Activation: starting connection 'Wired 
connection 1' (bd12b809-b1dd-4fa7-92b6-4d840187d333)
 /x/var/log/syslog:Feb 22 05:44:06 op755 NetworkManager[740]: <info>  
[1519299846.7225] device (enp0s25): state change: disconnected -> prepare 
(reason 'none') [30 40 0]
 /x/var/log/syslog:Feb 22 05:44:06 op755 NetworkManager[740]: <info>  
[1519299846.7230] device (enp0s25): state change: prepare -> config (reason 
'none') [40 50 0]
 /x/var/log/syslog:Feb 22 05:44:06 op755 kernel: [   50.404855] e1000e: enp0s25 
NIC Link is Up 1000 Mbps Full Duplex, Flow Control: Rx/Tx
 /x/var/log/syslog:Feb 22 05:44:06 op755 kernel: [   50.404990] IPv6: 
ADDRCONF(NETDEV_CHANGE): enp0s25: link becomes ready
 /x/var/log/syslog:Feb 22 05:44:06 op755 NetworkManager[740]: <info>  
[1519299846.7237] device (enp0s25): state change: config -> ip-config (reason 
'none') [50 70 0]
 /x/var/log/syslog:Feb 22 05:44:06 op755 NetworkManager[740]: <info>  
[1519299846.8199] dhcp4 (enp0s25): activation: beginning transaction (timeout 
in 45 seconds)
 /x/var/log/syslog:Feb 22 05:44:07 op755 NetworkManager[740]: <info>  
[1519299847.3646] dhcp4 (enp0s25): dhclient started with pid 874
 /x/var/log/syslog:Feb 22 05:44:08 op755 dhclient[874]: DHCPREQUEST of 
192.168.0.42 on enp0s25 to 255.255.255.255 port 67 (xid=0x2e6ceb5f)
 /x/var/log/syslog:Feb 22 05:44:08 op755 avahi-daemon[744]: Joining mDNS 
multicast group on interface enp0s25.IPv4 with address 192.168.0.42.
 /x/var/log/syslog:Feb 22 05:44:08 op755 avahi-daemon[744]: New relevant 
interface enp0s25.IPv4 for mDNS.
 /x/var/log/syslog:Feb 22 05:44:08 op755 avahi-daemon[744]: Registering new 
address record for 192.168.0.42 on enp0s25.IPv4.
 /x/var/log/syslog:Feb 22 05:44:08 op755 NetworkManager[740]: <info>  
[1519299848.6363] dhcp4 (enp0s25): state changed unknown -> bound
 /x/var/log/syslog:Feb 22 05:44:08 op755 NetworkManager[740]: <info>  
[1519299848.6374] device (enp0s25): state change: ip-config -> ip-check (reason 
'none') [70 80 0]
 /x/var/log/syslog:Feb 22 05:44:08 op755 NetworkManager[740]: <info>  
[1519299848.6380] device (enp0s25): state change: ip-check -> secondaries 
(reason 'none') [80 90 0]
 /x/var/log/syslog:Feb 22 05:44:08 op755 NetworkManager[740]: <info>  
[1519299848.6383] device (enp0s25): state change: secondaries -> activated 
(reason 'none') [90 100 0]
 /x/var/log/syslog:Feb 22 05:44:08 op755 avahi-daemon[744]: Joining mDNS 
multicast group on interface enp0s25.IPv6 with address fe80::221:70ff:fe32:6aee.
 /x/var/log/syslog:Feb 22 05:44:08 op755 avahi-daemon[744]: New relevant 
interface enp0s25.IPv6 for mDNS.
 /x/var/log/syslog:Feb 22 05:44:08 op755 avahi-daemon[744]: Registering new 
address record for fe80::221:70ff:fe32:6aee on enp0s25.*.
 /x/var/log/syslog:Feb 22 05:44:08 op755 NetworkManager[740]: <info>  
[1519299848.8838] policy: set 'Wired connection 1' (enp0s25) as default for 
IPv4 routing and DNS
 /x/var/log/syslog:Feb 22 05:44:08 op755 NetworkManager[740]: <info>  
[1519299848.9063] device (enp0s25): Activation: successful, device activated.
 /x/var/log/syslog:Feb 22 05:44:08 op755 nm-dispatcher: req:2 'up' [enp0s25]: 
new request (1 scripts)
 /x/var/log/syslog:Feb 22 05:44:08 op755 nm-dispatcher: req:2 'up' [enp0s25]: 
start running ordered scripts...
 /x/var/log/syslog:Feb 22 05:44:09 op755 dnsmasq[889]: using nameserver 
8.8.8.8#53(via enp0s25)
 /x/var/log/syslog:Feb 22 05:44:09 op755 dnsmasq[889]: using nameserver 
8.8.4.4#53(via enp0s25)
 /x/var/log/syslog:Feb 22 05:44:12 op755 ntpd[1065]: Listen normally on 3 
enp0s25 192.168.0.42:123
 /x/var/log/syslog:Feb 22 05:44:12 op755 ntpd[1065]: Listen normally on 5 
enp0s25 [fe80::221:70ff:fe32:6aee%2]:123
 /x/var/log/syslog:Feb 22 05:44:14 op755 ntpd[1065]: DNS timeserver.uleth.ca -> 
142.66.33.101

should bionic be able to work without network manager?  what do i have
to do to get it working?

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Title:
  bionic mini.iso dhcp falls

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