I do have the issue on 17.10.
my temporary fix would be to change the logging to syslog in
/etc/tinyproxy/tinyproxy.conf
`Syslog On`
or to insert
`create 640 tinyproxy tinyproxy
`
into the /etc/logrotate.d/tinyproxy
```
# cat /etc/logrotate.d/tinyproxy
Public bug reported:
Logrotate should chown the new logfile with user tinyproxy tinyproxy and
chmod 640
so the line
create 640 tinyproxy tinyproxy
should be added to /etc/logrotate.d/tinyproxy
ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: tinyproxy 1.8.4-2
Uname: Linux 4.15.0-0