Upgraded to VyOS 1.3-rolling-201912222230 rolling and noticed I still have a `vyos` user floating around:
```
# show system login user vyos
authentication {
encrypted-password xxxxxxxxx
plaintext-password ""
}
level admin
[edit]
# delete system login user vyos
[edit]
# commit
Failed to generate committed config
```
On a different server running the same version, I didn't have an issue.
This was the only logging I could find:
```
cp w->tw failed[boost::filesystem::copy_file: Permission denied: "/opt/vyatta/config/tmp/new_config_5542/.unionfs-fuse/system/login/user/kroy/level/node.val_HIDDEN~", "/opt/vyatta/config/tmp/tmp_5542/work/.unionfs-fuse/system/login/user/kroy/level/node.val_HIDDEN~"]
cp[/opt/vyatta/config/tmp/new_config_5874]->[/opt/vyatta/config/tmp/tmp_5874/work]
cp w->tw failed[boost::filesystem::copy_file: Permission denied: "/opt/vyatta/config/tmp/new_config_5874/.unionfs-fuse/system/login/user/kroy/level/node.val_HIDDEN~", "/opt/vyatta/config/tmp/tmp_5874/work/.unionfs-fuse/system/login/user/kroy/level/node.val_HIDDEN~"]
cp[/opt/vyatta/config/tmp/new_config_6357]->[/opt/vyatta/config/tmp/tmp_6357/work]
cp w->tw failed[boost::filesystem::copy_file: Permission denied: "/opt/vyatta/config/tmp/new_config_6357/.unionfs-fuse/system/login/user/kroy/level/node.val_HIDDEN~", "/opt/vyatta/config/tmp/tmp_6357/work/.unionfs-fuse/system/login/user/kroy/level/node.val_HIDDEN~"]
```