Mam aplikację PHP (CodeIgniter) z plikiem startowym
~robert/public_html/index.php
Próbuję usunąć nazwę pliku z URL, tzn. np. zamiast
http://localhost/~robert/index.php/admin (to mi działa) chciałbym mieć
http://localhost/~robert/admin (to mi jeszcze nie działa).
Zrobiłem tak (wg informacji z Internetu):

W katalogu ~robert/public_html mam plik .htaccess o treści:

#v+

AuthUserFile "/home/robert/application/resources/.htpass"
AuthName "Strony zabezpieczone"
AuthType Basic
require valid-user

ErrorDocument 401 "/home/robert/public_html/denial.html"

DirectoryIndex index.php

RewriteEngine on
RewriteBase /~robert/

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond $1 !^(index\.php|robots\.txt|denial\.html|resources|cap
tcha)
RewriteRule ~(.*)$ /index.php/$1 [L,QSA]

php_value upload_max_filesize 10M
php_value post_max_size 70M

#v-

Plik ma atrybuty: -rw-rw---- 1 robert www-data 531 paź 4 08:44 .htaccess
Katalog ~robert/public_html ma atrybuty: drwxrwx--- 6 robert www-data 4096
paź 3 17:57 ./
Pracuję pod Linux Mint 17.3 Rosa z Apache Server version: Apache/2.4.7

Problem w tym, że przy próbie otwarcia http://localhost/~robert/admin mam
błąd: Not Found The requested URL /~robert/admin/ was not found on this
server. Nie wiem co jest źle.

error.log Apache'a zawiera:
[Tue Oct 04 06:09:04.018435 2016] [so:warn] [pid 1643] AH01574: module
mono_module is already loaded, skipping
[Tue Oct 04 06:09:04.062335 2016] [:error] [pid 1649] Failed running
'/usr/bin/mod-mono-server2 --filename /tmp/mod_mono_server_global --nonstop
--master (null) (null) (null) (null) (null) (null) (null) (null)'. Reason:
No such file or directory
[Tue Oct 04 06:09:04.092888 2016] [mpm_prefork:notice] [pid 1645] AH00163:
Apache/2.4.7 (Ubuntu) mod_mono/2.11 PHP/5.5.9-1ubuntu4.19 configured --
resuming normal operations
[Tue Oct 04 06:09:04.092959 2016] [core:notice] [pid 1645] AH00094: Command
line: '/usr/sbin/apache2'
Listening on: /tmp/.mod_mono_server4
Root directory: /

access.log Apache'a zawiera:
localhost - Robert [04/Oct/2016:08:04:42 +0200] "GET /~robert/admin/
HTTP/1.1" 404 502 "-" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:48.0)
Gecko/20100101 Firefox/48.0"
localhost - Robert [04/Oct/2016:08:12:57 +0200] "GET /~robert/admin/
HTTP/1.1" 404 502 "-" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:48.0)
Gecko/20100101 Firefox/48.0"
localhost - Robert [04/Oct/2016:08:28:32 +0200] "GET /~robert/admin/
HTTP/1.1" 404 502 "-" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:48.0)
Gecko/20100101 Firefox/48.0"
localhost - Robert [04/Oct/2016:08:28:38 +0200] "GET /~robert/ HTTP/1.1" 200
9136 "-" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:48.0) Gecko/20100101
Firefox/48.0"
localhost - Robert [04/Oct/2016:08:28:39 +0200] "GET
/~robert/captcha/1475562519.7357.jpg HTTP/1.1" 200 2766
"http://localhost/~robert/" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64;
rv:48.0) Gecko/20100101 Firefox/48.0"
localhost - Robert [04/Oct/2016:08:28:44 +0200] "GET /~robert/admin/
HTTP/1.1" 404 501 "-" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:48.0)
Gecko/20100101 Firefox/48.0"
localhost - - [04/Oct/2016:08:44:18 +0200] "GET /~robert/admin/ HTTP/1.1"
404 847 "-" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:48.0) Gecko/20100101
Firefox/48.0"
localhost - Robert [04/Oct/2016:08:44:19 +0200] "GET /~robert/admin/
HTTP/1.1" 404 501 "-" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:48.0)
Gecko/20100101 Firefox/48.0"
localhost - - [04/Oct/2016:08:44:19 +0200] "GET /favicon.ico HTTP/1.1" 404
498 "-" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:48.0) Gecko/20100101
Firefox/48.0"
localhost - Robert [04/Oct/2016:08:44:31 +0200] "GET /~robert/admin/
HTTP/1.1" 404 502 "-" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:48.0)
Gecko/20100101 Firefox/48.0"