After upgrade to bullseye I get: Aug 19 09:56:59 dell2 systemd[1]: Starting LSB: Squid Deb Package HTTP Proxy... Aug 19 09:56:59 dell2 squid-deb-proxy[6871]: Starting Squid Deb HTTP Proxy: squid-deb-proxy Aug 19 09:56:59 dell2 squid-deb-proxy[6878]: 2021/08/19 09:56:59| FATAL: Unable to open configuration file: /etc/squid-deb-proxy/squid-deb-proxy.conf: (13) Permission denied Aug 19 09:56:59 dell2 squid-deb-proxy[6878]: 2021/08/19 09:56:59| Squid Cache (Version 4.13): Terminated abnormally. Aug 19 09:56:59 dell2 squid-deb-proxy[6878]: CPU Usage: 0.022 seconds = 0.015 user + 0.007 sys Aug 19 09:56:59 dell2 squid-deb-proxy[6878]: Maximum Resident Size: 50240 KB Aug 19 09:56:59 dell2 squid-deb-proxy[6878]: Page faults with physical i/o: 0 Aug 19 09:57:00 dell2 squid-deb-proxy[6889]: 2021/08/19 09:57:00| FATAL: Unable to open configuration file: /etc/squid-deb-proxy/squid-deb-proxy.conf: (13) Permission denied Aug 19 09:57:00 dell2 squid-deb-proxy[6889]: 2021/08/19 09:57:00| Squid Cache (Version 4.13): Terminated abnormally. Aug 19 09:57:00 dell2 squid-deb-proxy[6889]: CPU Usage: 0.023 seconds = 0.011 user + 0.011 sys Aug 19 09:57:00 dell2 squid-deb-proxy[6889]: Maximum Resident Size: 50608 KB Aug 19 09:57:00 dell2 squid-deb-proxy[6889]: Page faults with physical i/o: 0 Aug 19 09:57:00 dell2 squid-deb-proxy[6890]: failed! Aug 19 09:57:00 dell2 systemd[1]: Started LSB: Squid Deb Package HTTP Proxy.
drwxr-xr-x 6 root root 4096 18. 8. 22:16 /etc/squid-deb-proxy -rw-r--r-- 1 root root 3368 26. 2. 2019 /etc/squid-deb-proxy/squid-deb-proxy.conf ls -lc /etc/apparmor.d/usr.sbin.squid -rw-r--r-- 1 root root 1485 18. 8. 22:15 /etc/apparmor.d/usr.sbin.squid So it came with upgrade. I have not modified it yet. It has '/etc/squid/** r,' I added: /etc/squid-deb-proxy/** r, /var/log/squid-deb-proxy/* rw, /var/run/squid-deb-proxy.pid rwk, and non standart /data/cache/squid-deb-proxy/** rw, because I have moved squid cache Thanks to Jérémy Viès apparmor_parser -r /etc/apparmor.d/usr.sbin.squid systemctl restart squid-deb-proxy Thanks to jfp Aug 19 11:35:29 dell2 systemd[1]: Starting LSB: Squid Deb Package HTTP Proxy... Aug 19 11:35:29 dell2 squid-deb-proxy[8952]: Starting Squid Deb HTTP Proxy: squid-deb-proxy Aug 19 11:35:29 dell2 squid-deb-proxy[8960]: 2021/08/19 11:35:29| Warning: empty ACL: acl blockedpkgs urlpath_regex "/etc/squid-deb-proxy/autogenerated/pkg-blacklist-regexp.acl" Aug 19 11:35:29 dell2 squid-deb-proxy[8960]: 2021/08/19 11:35:29| FATAL: failed to open /var/run/squid-deb-proxy.pid: (13) Permission denied Aug 19 11:35:29 dell2 squid-deb-proxy[8960]: exception location: File.cc(190) open Aug 19 11:35:29 dell2 squid-deb-proxy[8971]: 2021/08/19 11:35:29| Warning: empty ACL: acl blockedpkgs urlpath_regex "/etc/squid-deb-proxy/autogenerated/pkg-blacklist-regexp.acl" Aug 19 11:35:29 dell2 avahi-daemon[457]: Files changed, reloading. Aug 19 11:35:29 dell2 avahi-daemon[457]: Loading service file /services/squid-deb-proxy.service. Aug 19 11:35:29 dell2 squid-deb-proxy[8952]: . Aug 19 11:35:29 dell2 systemd[1]: Started LSB: Squid Deb Package HTTP Proxy. I changed to /run/squid-deb-proxy.pid rwk, because: lrwxrwxrwx 1 root root 4 15. 1. 2015 /var/run -> /run Now it works! Only those 'empty ACL' warnings remain. - jkn
