new doc docs/misc_tips_troubleshooting.md

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* [FreeBSD Jails on FreeNAS](freebsd_jails_on_freenas.md)
* [Quick Dirty Redis Nspawn Container on Arch Linux](arch_redis_nspawn.md)
* [Quick Dirty Postgresql Nspawn Container on Arch Linux](arch_postgresql_nspawn.md)
* [Misc Tips, Trouble Shooting](misc_tips_troubleshooting.md)
* [Self Signed Certs](self_signed_certs.md)
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# Misc Tips, TroubleShooting
## Sending commands to LXD containers
Use `bash -c "<command>"` for commands with wildcards. i.e.
```bash
for machine in $(lxc list | grep RUNNING | awk '{print $2}') ;\
do lxc exec "${machine}" -- bash -c "cat /etc/apt/apt.conf.d/02*" ; done
```
## Ubuntu-Mate-Welcome-Center doesn't work some for some repos
Perhaps your apt-cacher-ng proxy server isn't configured to allow
traffic through from https sources. Make sure the following is
uncommented. This applies for all PPA's that use https.
```conf
# /etc/apt-cacher-ng/acng.conf
PassThroughPattern: .*
```