Unable to resolve 404 errors after saving permalink settings and rewrite rules

I am new to WordPress and recently installed it on a local web server. My server is running Raspbian and Apache 2.4.38.

My WP site is currently very small as I’m just getting started. Aside from the home page, it has one static page and one post. Last night, going to those pages results in a 404 error.

Any help or guidance would be greatly appreciated!

Chrome shows this:

Not Found
The requested URL was not found on this server.
Apache/2.4.38 (Raspbian) Server at c64-geek.ddnsgeek.com Port 443

After searching online, I’ve tried the following:
– switched to troubleshooting mode, with all plug-ins disabled and default theme active (TwentyTwenty)
– enabled WP debug logging and checked the log file for possible clues
– changing/saving permalinks settings multiple times
– changed permission on .htaccess and save permalink settings
– verified that .htaccess has the expected code
– verified that mod-rewrite is installed and active
– restarted apache
– cleared browser cache and did a hard-refresh (ctrl-F5)

None of that has solved the issue for me.

There is one theme-related error in the WordPress debug.log when loading the home page, but nothing new when trying to go to the problem pages. That error is:

PHP Notice:  Undefined variable: widget_footer_width in /var/www/html/wp/wp
-content/themes/potter/inc/customizer/styles.php on line 2567

After restarting apache and trying to load the page, apache’s access.log contains:

192.168.1.254 - - [14/May/2020:23:56:26 -0500] "GET /wp/amiga-2000hd/ HTTP/1.1" 404 4301 "https://c64-geek.ddnsgeek.com/wp/" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.138 Safari/537.36"
192.168.1.254 - - [14/May/2020:23:56:26 -0500] "GET /favicon.ico HTTP/1.1" 404 526 "https://c64-geek.ddnsgeek.com/wp/amiga-2000hd/" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.138 Safari/537.36"

Nothing is written to apache’s error.log when attempting to load the page.

Below is the full text of Site Health Info:

Notice:  Array to string conversion in /var/www/html/wp/wp-content/plugins/health-check/includes/class-health-check-debug-data.php on line 1172

### wp-core ###

version: 5.4.1
site_language: en_US
user_language: en_US
permalink: /%year%/%monthnum%/%day%/%postname%/
https_status: true
user_registration: 0
default_comment_status: open
multisite: false
user_count: 1
dotorg_communication: true

### wp-paths-sizes ###

wordpress_path: /var/www/html/wp
wordpress_size: 39.59 MB (41511611 bytes)
uploads_path: /var/www/html/wp/wp-content/uploads
uploads_size: 3.70 MB (3883226 bytes)
themes_path: /var/www/html/wp/wp-content/themes
themes_size: 20.76 MB (21764485 bytes)
plugins_path: /var/www/html/wp/wp-content/plugins
plugins_size: 111.90 MB (117336140 bytes)
database_size: 2.28 MB (2392064 bytes)
total_size: 178.23 MB (186887526 bytes)

### wp-active-theme ###

name: Potter (potter)
version: 1.1.6
author: wppotter
author_website: (undefined)
parent_theme: none
theme_features: custom-logo, custom-background, title-tag, post-thumbnails, automatic-feed-links, html5, customize-selective-refresh-widgets, menus, editor-styles, align-wide, editor-font-sizes, header-footer-elementor, widgets
theme_path: /var/www/html/wp/wp-content/themes/potter

### wp-themes-inactive (8) ###

Library Books: version: 1.5, author: sinsikha
MH Magazine lite: version: 2.8.6, author: MH Themes
MH RetroMag: version: 1.0.1, author: MH Themes
Polestar: version: 1.4.0, author: Puro
SiteOrigin Corp: version: 1.16.1, author: SiteOrigin
SMNTCS Retro: version: 1.9, author: Niels Lange
Twenty Twenty: version: 1.2, author: the WordPress team (latest version: 1.3)
Vantage: version: 1.14.5, author: SiteOrigin

### wp-mu-plugins (1) ###

Health Check Troubleshooting Mode: author: (undefined), version: 1.7.1

### wp-plugins-active (7) ###

Akismet Anti-Spam: version: 4.1.5, author: Automattic
Classic Editor: version: 1.5, author: WordPress Contributors
Health Check & Troubleshooting: version: 1.4.4, author: The WordPress.org community
Page Builder by SiteOrigin: version: 2.10.16, author: SiteOrigin
SiteOrigin Widgets Bundle: version: 1.16.1, author: SiteOrigin
UpdraftPlus - Backup/Restore: version: 1.16.23, author: UpdraftPlus.Com, DavidAnderson
WPForms Lite: version: 1.6.0.1, author: WPForms

### wp-plugins-inactive (15) ###

Autoptimize: version: 2.7.1, author: Frank Goossens (futtta)
bbPress: version: 2.6.4, author: The bbPress Contributors
BuddyPress: version: 5.2.0, author: The BuddyPress Community (latest version: 6.0.0)
Download Manager: version: 3.0.96, author: W3 Eden
Elementor: version: 2.9.8, author: Elementor.com
Glue for Yoast SEO & AMP: version: 0.6, author: Joost de Valk
LiteSpeed Cache: version: 3.0.8.6, author: LiteSpeed Technologies (latest version: 3.0.9)
Multiple Themes: version: 7.1.1, author: David Gewirtz
Simple File List: version: 4.2.7, author: Mitchell Bennis
TablePress: version: 1.11, author: Tobias Bäthge
WordPress Importer: version: 0.7, author: wordpressdotorg
WP-Optimize - Clean, Compress, Cache: version: 3.0.19, author: David Anderson, Ruhani Rabin, Team Updraft
WP Fastest Cache: version: 0.9.0.6, author: Emre Vona
WP Maintenance Mode: version: 2.2.4, author: Designmodo
Yoast SEO: version: 14.0.4, author: Team Yoast (latest version: 14.1)

### wp-media ###

image_editor: WP_Image_Editor_Imagick
imagick_module_version: 1690
imagemagick_version: ImageMagick 6.9.10-23 Q16 arm 20190101 https://imagemagick.org
imagick_limits: 
	imagick::RESOURCETYPE_AREA: 122 MB
	imagick::RESOURCETYPE_DISK: 1073741824
	imagick::RESOURCETYPE_FILE: 6144
	imagick::RESOURCETYPE_MAP: 512 MB
	imagick::RESOURCETYPE_MEMORY: 256 MB
	imagick::RESOURCETYPE_THREAD: 4
gd_version: 2.2.5
ghostscript_version: 9.27

### wp-server ###

server_architecture: Linux 4.19.97-v7l+ armv7l
httpd_software: Apache/2.4.38 (Raspbian)
php_version: 7.3.14-1~deb10u1
php_sapi: apache2handler
max_input_variables: 1000
time_limit: 30
memory_limit: 256M
max_input_time: 60
upload_max_size: 2M
php_post_max_size: 8M
curl_version: 7.64.0 OpenSSL/1.1.1d
suhosin: false
imagick_availability: true
server-headers: 
	date: Fri, 15 May 2020 04:27:16 GMT
	server: Apache/2.4.38 (Raspbian)
	expires: Wed, 11 Jan 1984 05:00:00 GMT
	cache-control: no-cache, must-revalidate, max-age=0
	link: Array
	vary: Accept-Encoding
	content-encoding: gzip
	content-length: 6413
	content-type: text/html; charset=UTF-8
htaccess_extra_rules: false

### wp-database ###

extension: mysqli
server_version: 10.0.28-MariaDB-2+b1
client_version: mysqlnd 5.0.12-dev - 20150407 - $Id: 7cc7cc96e675f6d72e5cf0f267f48e167c2abb23 $

### wp-constants ###

WP_HOME: undefined
WP_SITEURL: undefined
WP_CONTENT_DIR: /var/www/html/wp/wp-content
WP_PLUGIN_DIR: /var/www/html/wp/wp-content/plugins
WP_MAX_MEMORY_LIMIT: 256M
WP_DEBUG: true
WP_DEBUG_DISPLAY: true
WP_DEBUG_LOG: true
SCRIPT_DEBUG: false
WP_CACHE: false
CONCATENATE_SCRIPTS: undefined
COMPRESS_SCRIPTS: undefined
COMPRESS_CSS: undefined
WP_LOCAL_DEV: undefined

### wp-filesystem ###

wordpress: writable
wp-content: writable
uploads: writable
plugins: writable
themes: writable
mu-plugins: writable

### wpforms ###

version: 1.6.0.1
license: false
lite: May 12, 2020 @ 2:43am
total_forms: undefined
total_entries: undefined

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