Apache2 install failed

Weird
installing apache2 failed with
Package not found.

Appreciate help greatly

apt update
Get:1 file:/var/cuda-repo-10-0-local-10.0.166 InRelease
Ign:1 file:/var/cuda-repo-10-0-local-10.0.166 InRelease
Get:2 file:/var/visionworks-repo InRelease
Ign:2 file:/var/visionworks-repo InRelease
Get:3 file:/var/visionworks-sfm-repo InRelease
Ign:3 file:/var/visionworks-sfm-repo InRelease
Get:4 file:/var/visionworks-tracking-repo InRelease
Ign:4 file:/var/visionworks-tracking-repo InRelease
Get:5 file:/var/cuda-repo-10-0-local-10.0.166 Release [574 B]
Get:6 file:/var/visionworks-repo Release [1.999 B]
Get:7 file:/var/visionworks-sfm-repo Release [2.003 B]
Get:8 file:/var/visionworks-tracking-repo Release [2.008 B]
Get:5 file:/var/cuda-repo-10-0-local-10.0.166 Release [574 B]
Get:6 file:/var/visionworks-repo Release [1.999 B]
Get:7 file:/var/visionworks-sfm-repo Release [2.003 B]
Ign:18 http://ports.ubuntu.com bionic/main i386 Packages
Ign:58 http://ports.ubuntu.com bionic/restricted i386 Packages
Ign:59 http://ports.ubuntu.com bionic/universe i386 Packages
Ign:60 http://ports.ubuntu.com bionic/multiverse i386 Packages
Ign:61 http://ports.ubuntu.com bionic-security/main i386 Packages
Ign:62 http://ports.ubuntu.com bionic-security/restricted i386 Packages
Ign:63 http://ports.ubuntu.com bionic-security/universe i386 Packages
Ign:64 http://ports.ubuntu.com bionic-security/multiverse i386 Packages
Ign:87 http://ports.ubuntu.com bionic-updates/main i386 Packages
Ign:88 http://ports.ubuntu.com bionic-updates/restricted i386 Packages
Ign:89 http://ports.ubuntu.com bionic-updates/universe i386 Packages
Ign:90 http://ports.ubuntu.com bionic-updates/multiverse i386 Packages
Ign:91 http://ports.ubuntu.com bionic-backports/main i386 Packages
Ign:92 http://ports.ubuntu.com bionic-backports/universe i386 Packages
Ign:93 http://ports.ubuntu.com/ubuntu-ports bionic/universe i386 Packages
Ign:18 http://ports.ubuntu.com bionic/main i386 Packages
Ign:58 http://ports.ubuntu.com bionic/restricted i386 Packages
Ign:59 http://ports.ubuntu.com bionic/universe i386 Packages
Ign:60 http://ports.ubuntu.com bionic/multiverse i386 Packages
Ign:61 http://ports.ubuntu.com bionic-security/main i386 Packages
Ign:62 http://ports.ubuntu.com bionic-security/restricted i386 Packages
Ign:63 http://ports.ubuntu.com bionic-security/universe i386 Packages
Ign:64 http://ports.ubuntu.com bionic-security/multiverse i386 Packages
Ign:87 http://ports.ubuntu.com bionic-updates/main i386 Packages
Ign:88 http://ports.ubuntu.com bionic-updates/restricted i386 Packages
Ign:89 http://ports.ubuntu.com bionic-updates/universe i386 Packages
Ign:90 http://ports.ubuntu.com bionic-updates/multiverse i386 Packages
Ign:91 http://ports.ubuntu.com bionic-backports/main i386 Packages
Ign:92 http://ports.ubuntu.com bionic-backports/universe i386 Packages
Ign:93 http://ports.ubuntu.com/ubuntu-ports bionic/universe i386 Packages
Err:18 http://ports.ubuntu.com bionic/main i386 Packages
404 Not Found [IP: 91.189.88.150 80]
Ign:58 http://ports.ubuntu.com bionic/restricted i386 Packages
Ign:59 http://ports.ubuntu.com bionic/universe i386 Packages
Ign:60 http://ports.ubuntu.com bionic/multiverse i386 Packages
Err:61 http://ports.ubuntu.com bionic-security/main i386 Packages
404 Not Found [IP: 91.189.88.150 80]
Ign:62 http://ports.ubuntu.com bionic-security/restricted i386 Packages
Ign:63 http://ports.ubuntu.com bionic-security/universe i386 Packages
Ign:64 http://ports.ubuntu.com bionic-security/multiverse i386 Packages
Err:87 http://ports.ubuntu.com bionic-updates/main i386 Packages
404 Not Found [IP: 91.189.88.150 80]
Ign:88 http://ports.ubuntu.com bionic-updates/restricted i386 Packages
Ign:89 http://ports.ubuntu.com bionic-updates/universe i386 Packages
Ign:90 http://ports.ubuntu.com bionic-updates/multiverse i386 Packages
Err:91 http://ports.ubuntu.com bionic-backports/main i386 Packages
404 Not Found [IP: 91.189.88.150 80]
Ign:92 http://ports.ubuntu.com bionic-backports/universe i386 Packages
Err:93 http://ports.ubuntu.com/ubuntu-ports bionic/universe i386 Packages
404 Not Found [IP: 91.189.88.150 80]
Fetched 736 kB in 11s (69,9 kB/s)
Ign:62 http://ports.ubuntu.com bionic-security/restricted i386 Packages
Ign:63 http://ports.ubuntu.com bionic-security/universe i386 Packages
Ign:64 http://ports.ubuntu.com bionic-security/multiverse i386 Packages
Ign:87 http://ports.ubuntu.com bionic-updates/main i386 Packages
Ign:88 http://ports.ubuntu.com bionic-updates/restricted i386 Packages
Ign:89 http://ports.ubuntu.com bionic-updates/universe i386 Packages
Ign:90 http://ports.ubuntu.com bionic-updates/multiverse i386 Packages
Ign:91 http://ports.ubuntu.com bionic-backports/main i386 Packages
Ign:92 http://ports.ubuntu.com bionic-backports/universe i386 Packages
Ign:93 http://ports.ubuntu.com/ubuntu-ports bionic/universe i386 Packages
Ign:18 http://ports.ubuntu.com bionic/main i386 Packages
Ign:58 http://ports.ubuntu.com bionic/restricted i386 Packages
Ign:59 http://ports.ubuntu.com bionic/universe i386 Packages
Ign:60 http://ports.ubuntu.com bionic/multiverse i386 Packages
Ign:61 http://ports.ubuntu.com bionic-security/main i386 Packages
Ign:62 http://ports.ubuntu.com bionic-security/restricted i386 Packages
Ign:63 http://ports.ubuntu.com bionic-security/universe i386 Packages
Ign:64 http://ports.ubuntu.com bionic-security/multiverse i386 Packages
Ign:87 http://ports.ubuntu.com bionic-updates/main i386 Packages
Ign:88 http://ports.ubuntu.com bionic-updates/restricted i386 Packages
Ign:89 http://ports.ubuntu.com bionic-updates/universe i386 Packages
Ign:90 http://ports.ubuntu.com bionic-updates/multiverse i386 Packages
Ign:91 http://ports.ubuntu.com bionic-backports/main i386 Packages
Ign:92 http://ports.ubuntu.com bionic-backports/universe i386 Packages
Ign:93 http://ports.ubuntu.com/ubuntu-ports bionic/universe i386 Packages
Err:18 http://ports.ubuntu.com bionic/main i386 Packages
404 Not Found [IP: 91.189.88.150 80]
Ign:58 http://ports.ubuntu.com bionic/restricted i386 Packages
Ign:59 http://ports.ubuntu.com bionic/universe i386 Packages
Ign:60 http://ports.ubuntu.com bionic/multiverse i386 Packages
Err:61 http://ports.ubuntu.com bionic-security/main i386 Packages
404 Not Found [IP: 91.189.88.150 80]
Ign:62 http://ports.ubuntu.com bionic-security/restricted i386 Packages
Ign:63 http://ports.ubuntu.com bionic-security/universe i386 Packages
Ign:64 http://ports.ubuntu.com bionic-security/multiverse i386 Packages
Err:87 http://ports.ubuntu.com bionic-updates/main i386 Packages
404 Not Found [IP: 91.189.88.150 80]
Ign:88 http://ports.ubuntu.com bionic-updates/restricted i386 Packages
Ign:89 http://ports.ubuntu.com bionic-updates/universe i386 Packages
Ign:90 http://ports.ubuntu.com bionic-updates/multiverse i386 Packages
Err:91 http://ports.ubuntu.com bionic-backports/main i386 Packages
404 Not Found [IP: 91.189.88.150 80]
Ign:92 http://ports.ubuntu.com bionic-backports/universe i386 Packages
Err:93 http://ports.ubuntu.com/ubuntu-ports bionic/universe i386 Packages
404 Not Found [IP: 91.189.88.150 80]
Fetched 736 kB in 11s (69,9 kB/s)
Reading package lists… Done
E: Failed to fetch http://ports.ubuntu.com/dists/bionic/main/binary-i386/Packages 404 Not Found [IP: 91.189.88.150 80]
E: Failed to fetch http://ports.ubuntu.com/dists/bionic-security/main/binary-i386/Packages 404 Not Found [IP: 91.189.88.150 80]
E: Failed to fetch http://ports.ubuntu.com/dists/bionic-updates/main/binary-i386/Packages 404 Not Found [IP: 91.189.88.150 80]
E: Failed to fetch http://ports.ubuntu.com/dists/bionic-backports/main/binary-i386/Packages 404 Not Found [IP: 91.189.88.150 80]
E: Failed to fetch http://ports.ubuntu.com/ubuntu-ports/dists/bionic/universe/binary-i386/Packages 404 Not Found [IP: 91.189.88.150 80]
E: Some index files failed to download. They have been ignored, or old ones used instead.

Those packages you are searching for are for an old 32-bit desktop PC architecture and not for 64-bit ARM (arm64/aarch64/ARMv8-a). Have you configured apt to search other repositories? If so, then it is the wrong repository.

On a TX2 (same release as the Nano), try this:

# "| less" if you want a pager.
apt search apache2 | less

Part of what I see is:

Full Text Search...
apache2/bionic-updates,bionic-security 2.4.29-1ubuntu4.11 arm64
  Apache HTTP Server

apache2-bin/bionic-updates,bionic-security 2.4.29-1ubuntu4.11 arm64
  Apache HTTP Server (modules and other binary files)

apache2-data/bionic-updates,bionic-security 2.4.29-1ubuntu4.11 all
  Apache HTTP Server (common files)

apache2-dbg/bionic-updates,bionic-security 2.4.29-1ubuntu4.11 arm64
  Apache debugging symbols

apache2-dev/bionic-updates,bionic-security 2.4.29-1ubuntu4.11 arm64
  Apache HTTP Server (development headers)

apache2-doc/bionic-updates,bionic-security 2.4.29-1ubuntu4.11 all
  Apache HTTP Server (on-site documentation)

apache2-ssl-dev/bionic-updates,bionic-security 2.4.29-1ubuntu4.11 arm64
  Apache HTTP Server (mod_ssl development headers)

apache2-suexec-custom/bionic-updates,bionic-security 2.4.29-1ubuntu4.11 arm64
  Apache HTTP Server configurable suexec program for mod_suexec

apache2-suexec-pristine/bionic-updates,bionic-security 2.4.29-1ubuntu4.11 arm64
  Apache HTTP Server standard suexec program for mod_suexec

apache2-utils/bionic-updates,bionic-security 2.4.29-1ubuntu4.11 arm64
  Apache HTTP Server (utility programs for web servers)

This should succeed:

sudo apt-get install apache2