Given that you can configure/raise the network link, as stated here,
then a scan of the "dmesg" should have some details on the failure to set up networking during the boot process.
If "dmesg" reveals nothing, then you will need to scan "syslog" to identify what happens when you enter your manual command, and compare that with any similar (but failed) action in the dmesg logs.
From time to time, this kind of problem will happen when you install Linux/Ubuntu on computers, especially for those from "big-brand" manufacturers (who may have custom hardware for which the Linux Hardware Database has no knowledge), or, similarly, other very new hardware. It can even happen for very old hardware for which the corresponding data may have been deemed "no longer in use" and consequently purged from the Hardware Database.
If it is too new, you will need to pursue matters with the computer's manufacturer in order to see if you can "motivate" them to be more proactive and supporting Linux on your newly purchased "Ferrari"! 
It is because of such possible incompatibility that it is critical that you run a Live distro from CD/USB, before purchasing, in order to do a survey of all the hardware that is on the intended installation target computer, to confirm that the distro does have both,
hardware definition/specification files for any component used in that intended computer, and
the report of that full hardware list does show all the components that you expect to see listed.
Any evidence of the hardware report not showing a critical component, such as the internet interface card, should give pause to any consideration of continuing with the installation until you can resolve the why:
- loose hardware;
- dead hardware; or
- unknown hardware.
BEFORE distro install, from the Live session, a good tool to obtain a report of what you have on the computer is
hw-probe -probe -check -all
"hwinfo" is a different probe which can offer a good abbreviated summary of harware, using
hwinfo --short
or, a much more detailed report on a per component basis with the simple command
hwinfo
A different probe with less detail than the last, but offers a hierarchy to the component inter-connect (which can help troubleshooting some special cases), is
lshw -sanitize
Lastly, there is the "inxi" tool which has much popularity for giving short (or very detailed) summaries on a pinpoint basis. To that end, you can use the following script, which uses different instances of "inxi" to report various specific aspects of computer's installed/available hardware/software configuration.
Script HW_Admin__HostReport.sh:
#!/bin/sh
##############################################################################################
###
### $Id: HW_Admin__HostReport.sh,v 1.4 2022/08/17 22:59:33 root Exp $
###
### Script to report on various aspects of the current host OS, GUI, hardware, memory, storage, graphics.
###
##############################################################################################
if [ "${1}" = "--narrow" ]
then
OPTIONS="-y 80 -c 0"
else
OPTIONS="-y 255 -c 0"
fi
report_OS()
{
echo "\n\n######################################################################################################\n#### OPERATING SYSTEM DETAILS"
COM="inxi ${OPTIONS} -S -xxx"
echo "\n----------------------------------------------------------------------\n COMMAND: '${COM}'" ; ${COM}
#System: Host: OasisMega1 Kernel: 5.3.0-53-generic x86_64 bits: 64 gcc: 7.5.0 Desktop: MATE 1.20.1 (Gtk 3.22.30-1ubuntu4) info: mate-panel dm: lightdm Distro: Ubuntu 18.04.4 LTS
COM="inxi ${OPTIONS} -I -xxx"
echo "\n----------------------------------------------------------------------\n COMMAND: '${COM}'" ; ${COM}
#Info: Processes: 216 Uptime: 3:25 Memory: 1342.1/3683.4MB Init: systemd v: 237 runlevel: 5 Gcc sys: 7.5.0 Client: Shell (MachineReport.s running in MachineReport.s) inxi: 2.3.56
COM="inxi -c 0 -f -xxx 2>&1 | tail --lines=+3"
echo "\n----------------------------------------------------------------------\n COMMAND: '${COM}'" ; eval ${COM}
# CPU Flags: 3dnow 3dnowext 3dnowprefetch abm apic clflush cmov cmp_legacy constant_tsc cpuid cr8_legacy
# cx16 cx8 de extapic extd_apicid fpu fxsr fxsr_opt ht hw_pstate ibs lahf_lm lbrv lm mca mce misalignsse
# mmx mmxext monitor msr mtrr nonstop_tsc nopl npt nrip_save nx osvw pae pat pdpe1gb pge pni popcnt pse
# pse36 rdtscp rep_good sep skinit sse sse2 sse4a svm svm_lock syscall tsc vme vmmcall wdt
#COM="inxi -c 0 -f -xxx 2>&1 | tail --lines=+3 | cut -c12- | awk '{ printf(\"%s \", \$0 ) }' "
#echo "\n----------------------------------------------------------------------\n COMMAND: '${COM}'" ; inxi -c 0 -f -xxx 2>&1 | tail --lines=+3 | cut -c12- | awk '{ printf("%s ", $0 ) }' ; echo ""
#CPU Flags: 3dnow 3dnowext 3dnowprefetch abm apic clflush cmov cmp_legacy constant_tsc cpuid cr8_legacy cx16 cx8 de extapic extd_apicid fpu fxsr fxsr_opt ht hw_pstate ibs lahf_lm lbrv lm mca mce misalignsse mmx mmxext monitor msr mtrr nonstop_tsc nopl npt nrip_save nx osvw pae pat pdpe1gb pge pni popcnt pse pse36 rdtscp rep_good sep skinit sse sse2 sse4a svm svm_lock syscall tsc vme vmmcall wdt
COM="inxi ${OPTIONS} -r -xxx"
echo "\n----------------------------------------------------------------------\n COMMAND: '${COM}'" ; ${COM}
#Repos: Active apt sources in file: /etc/apt/sources.list
# deb http://archive.ubuntu.com/ubuntu bionic main restricted
# deb http://archive.ubuntu.com/ubuntu bionic-updates main restricted
# deb http://archive.ubuntu.com/ubuntu bionic universe
# deb http://archive.ubuntu.com/ubuntu bionic-updates universe
# deb http://archive.ubuntu.com/ubuntu bionic multiverse
# deb http://archive.ubuntu.com/ubuntu bionic-updates multiverse
# deb http://archive.ubuntu.com/ubuntu bionic-backports main restricted universe multiverse
# deb http://archive.canonical.com/ubuntu bionic partner
# deb http://archive.ubuntu.com/ubuntu bionic-security main restricted
# deb http://archive.ubuntu.com/ubuntu bionic-security universe
# deb http://archive.ubuntu.com/ubuntu bionic-security multiverse
} #report_OS()
report_NETWORK()
{
echo "\n\n######################################################################################################\n#### NETWORKING DETAILS"
COM="inxi ${OPTIONS} -i -xxx 2>&1 | tail --lines=+2"
echo "\n----------------------------------------------------------------------\n COMMAND: '${COM}'" ; eval ${COM}
# IF: enp2s0 state: up speed: 1000 Mbps duplex: full mac: 00:26:18:8a:b5:7a
# WAN IP: 174.115.236.50
# IF: enp2s0 ip-v4: 192.168.0.10 ip-v6-link: fe80::226:18ff:fe8a:b57a
# ip-v6-global: fd00:8494:8c30:fac2:226:18ff:fe8a:b57a/64
# ip-v6-global: 2607:fea8:c2a0:63:226:18ff:fe8a:b57a/64
} #report_NETWORK()
report_HARDWARE()
{
echo "\n\n######################################################################################################\n#### HOST HARDWARE DETAILS"
COM="inxi ${OPTIONS} -s -xxx"
echo "\n----------------------------------------------------------------------\n COMMAND: '${COM}'" ; ${COM}
#Sensors: System Temperatures: cpu: 44.0C mobo: 44.0C
# Fan Speeds (in rpm): cpu: 3245 sys-1: 0 sys-2: 0
COM="inxi ${OPTIONS} -B -xxx"
echo "\n----------------------------------------------------------------------\n COMMAND: '${COM}'" ; ${COM}
#Battery hidpp__0: charge: N/A condition: NA/NA Wh volts: NA model: Logitech Wireless Mouse M325 serial: 400a-7b-8b-e6-50 status: Discharging
COM="inxi ${OPTIONS} -M -xxx"
echo "\n----------------------------------------------------------------------\n COMMAND: '${COM}'" ; ${COM}
#Machine: Device: desktop Mobo: ASUSTeK model: M4A78-E v: Rev 1.xx serial: 101048580000313 BIOS: American Megatrends v: 2603 date: 04/13/2011
COM="inxi ${OPTIONS} -C -xxx"
echo "\n----------------------------------------------------------------------\n COMMAND: '${COM}'" ; ${COM}
#CPU: Triple core AMD Phenom II X4 810 (-MCP-) arch: K10 rev.2 cache: 1536 KB flags: (lm nx sse sse2 sse3 sse4a svm) bmips: 15651
# clock speeds: min/max: 800/2600 MHz 1: 1900 MHz 2: 1400 MHz 3: 1400 MHz
COM="inxi ${OPTIONS} -m -xxx"
echo "\n----------------------------------------------------------------------\n COMMAND: '${COM}'" ; ${COM}
#Memory: Used/Total: 1343.1/3683.4MB
# Array-1 capacity: 8 GB devices: 4 EC: None
# Device-1: DIMM0 size: 2 GB speed: 800 MT/s type: DDR (Synchronous) bus width: 64 bits manufacturer: N/A part: N/A serial: N/A
# Device-2: DIMM1 size: 2 GB speed: 800 MT/s type: DDR (Synchronous) bus width: 64 bits manufacturer: N/A part: N/A serial: N/A
# Device-3: DIMM2 size: No Module Installed type: N/A
# Device-4: DIMM3 size: No Module Installed type: N/A
COM="inxi ${OPTIONS} -G -xxx"
echo "\n----------------------------------------------------------------------\n COMMAND: '${COM}'" ; ${COM}
#Graphics: Card: Advanced Micro Devices [AMD/ATI] RS780D [Radeon HD 3300] bus-ID: 01:05.0 chip-ID: 1002:9614
# Display Server: X.Org 1.20.5 drivers: ati,radeon (unloaded: modesetting,fbdev,vesa) Resolution: [email protected]
# OpenGL: renderer: AMD RS780 (DRM 2.50.0 / 5.3.0-53-generic, LLVM 9.0.0) version: 3.3 Mesa 19.2.8 (compat-v: 3.0) Direct Render: Yes
COM="inxi ${OPTIONS} -A -xxx"
echo "\n----------------------------------------------------------------------\n COMMAND: '${COM}'" ; ${COM}
#Audio: Card-1 Advanced Micro Devices [AMD/ATI] RS780 HDMI Audio [Radeon 3000/3100 / HD 3200/3300] driver: snd_hda_intel bus-ID: 01:05.1 chip-ID: 1002:960f Sound: ALSA v: k5.3.0-53-generic
# Card-2 Advanced Micro Devices [AMD/ATI] SBx00 Azalia (Intel HDA) driver: snd_hda_intel bus-ID: 00:14.2 chip-ID: 1002:4383
COM="inxi ${OPTIONS} -N -xxx"
echo "\n----------------------------------------------------------------------\n COMMAND: '${COM}'" ; ${COM}
#Network: Card: Qualcomm Atheros AR8121/AR8113/AR8114 Gigabit or Fast Ethernet driver: ATL1E port: dc00 bus-ID: 02:00.0 chip-ID: 1969:1026
COM="inxi ${OPTIONS} -Dd -xxx"
echo "\n----------------------------------------------------------------------\n COMMAND: '${COM}'" ; ${COM}
#Drives: HDD Total Size: 4620.9GB (42.9% used)
# ID-1: /dev/sda model: WDC_WD20EZRX size: 2000.4GB serial: WD-WCC300611350 temp: 39C
# ID-2: /dev/sdb model: WDC_WD5000AAKS size: 500.1GB serial: WD-WMAWF0060756 temp: 39C
# ID-3: /dev/sdc model: WDC_WD20EZRZ size: 2000.4GB serial: WD-WCC4N4HJ7YCE temp: 37C
# ID-4: /dev/sdd model: WDC_WD1200JB size: 120.0GB serial: WD-WCALA1747715 temp: 46C
# Floppy-1: /dev/fd0
# Optical-1: /dev/sr0 model: ASUS DRW-24F1ST c rev: 1.00 dev-links: cdrom,cdrw,dvd,dvdrw
# Features: speed: 48x multisession: yes audio: yes dvd: yes rw: cd-r,cd-rw,dvd-r,dvd-ram state: running
COM="inxi ${OPTIONS} -plu -xxx"
echo "\n----------------------------------------------------------------------\n COMMAND: '${COM}'" ; ${COM}
#Partition: ID-1: / size: 288G used: 54G (20%) fs: ext4 dev: /dev/sda1 label: DB001_F1 uuid: f56b6086-229d-4c17-8a5b-e68de1a4e73d
# ID-2: /site/DB003_F1 size: 454G used: 21G (5%) fs: ext4 dev: /dev/sdb1 label: DB003_F1 uuid: 12d9cfcc-8da0-4ba6-a7f8-cd08870c2890
# ID-3: /site/DB004_F1 size: 108G used: 8.3G (9%) fs: ext4 dev: /dev/sdd1 label: DB004_F1 uuid: 5f3757ca-7b47-407b-b0e9-6c5ae68106e3
# ID-4: /site/DB002_F1 size: 295G used: 6.9G (3%) fs: ext4 dev: /dev/sdc1 label: DB002_F1 uuid: 0aa50783-954b-4024-99c0-77a2a54a05c2
# ID-5: /site/DB002_F2 size: 1.5T used: 985G (68%) fs: ext4 dev: /dev/sdc3 label: DB002_F2 uuid: 7e10c52e-fe20-497b-beab-f67e75cf7d83
# ID-6: /DB001_F2 size: 289G used: 73G (27%) fs: ext4 dev: /dev/sda7 label: DB001_F2 uuid: 7e9a663e-ff1d-4730-8544-c37519056b6f
# ID-7: /DB001_F3 size: 289G used: 237G (87%) fs: ext4 dev: /dev/sda8 label: DB001_F3 uuid: 4f7d4192-b136-4a94-b06b-736f76155816
# ID-8: /DB001_F4 size: 289G used: 242G (89%) fs: ext4 dev: /dev/sda9 label: DB001_F4 uuid: 7f37ffd4-779a-46c6-b440-f384fb75eb98
# ID-9: /DB001_F5 size: 193G used: 30G (17%) fs: ext4 dev: /dev/sda12 label: DB001_F5 uuid: 17a1582c-7dd2-4ea4-bc69-db6d2317ff92
# ID-10: /DB001_F6 size: 193G used: 161G (88%) fs: ext4 dev: /dev/sda13 label: DB001_F6 uuid: f255b2a2-8549-451f-9b97-f6ebe66c8d3a
# ID-11: /DB001_F7 size: 289G used: 18G (7%) fs: ext4 dev: /dev/sda14 label: DB001_F7 uuid: 58f622cd-2841-4967-8def-86dd38192769
# ID-12: swap-1 size: 1.04GB used: 0.00GB (0%) fs: swap dev: /dev/sda5 label: DB001_S3 uuid: c16e9d3b-0ea5-4c2b-808b-9962509f04dd
# ID-13: swap-2 size: 1.04GB used: 0.00GB (0%) fs: swap dev: /dev/sda6 label: DB001_S4 uuid: f9441354-ee42-4cef-912e-82e10a3d18af
# ID-14: swap-3 size: 4.29GB used: 0.00GB (0%) fs: swap dev: /dev/sdc2 label: DB002_S1 uuid: 7dd23169-56c6-4c2c-afbb-9e75d4de7652
# ID-15: swap-4 size: 1.04GB used: 0.00GB (0%) fs: swap dev: /dev/sda4 label: DB001_S2 uuid: 227afe2c-ee1a-4065-bc9d-24040ea01849
# ID-16: swap-5 size: 2.15GB used: 0.00GB (0%) fs: swap dev: /dev/sdd2 label: DB004_S1 uuid: a7de6699-4a57-4ed7-b3df-a1641b1c6ff9
# ID-17: swap-6 size: 4.29GB used: 0.00GB (0%) fs: swap dev: /dev/sdb2 label: DB003_S1 uuid: 48245d59-d265-459d-860c-d0caaf616fa7
# ID-18: swap-7 size: 1.04GB used: 0.00GB (0%) fs: swap dev: /dev/sda3 label: DB001_S1 uuid: c37e53cd-5882-401c-8ba3-172531a082e9
# ID-19: swap-8 size: 1.04GB used: 0.00GB (0%) fs: swap dev: /dev/sda10 label: DB001_S5 uuid: 3b9a2c7a-67d4-4de7-ae66-214937dc47f4
# ID-20: swap-9 size: 1.04GB used: 0.00GB (0%) fs: swap dev: /dev/sda11 label: DB001_S6 uuid: 78b04c8c-8ace-4b46-817d-7059aa1668b7
} #report_HARDWARE()
#123456789+123456789+123456789+123456789+123456789+123456789+123456789+123456789+123456789+123456789+123456789+123456789+123456789+123456789+123456789+123456789+123456789+123456789+123456789+123456789+123456789+123456789+123456789+123456789+123456789+123456789+123456789+123456789+123456789+123456789+123456789+
COLS_MAX_CONSOL=155 ; export COLS_MAX_CONSOL
OPTIONS="-y 255 -c 0"
REPORT=`basename "$0" ".sh" `.out
{
report_OS
report_NETWORK
report_HARDWARE
} 2>&1 | tee "${REPORT}"
echo "" ; ls -l "${REPORT}"
exit 0
exit 0
exit 0