Mathematica installation error

 cf: https://askubuntu.com/questions/422026/mathematica-installation-problem

Don't use directory/folder name with space

Safely power off USB drive

1. Umount all: e.g
   sudo umount /media/pi/ntfs_1TB
   sudo umount /media/pi/ext4_1.7TB
   sudo umount /media/pi/ext4_1TB
   
2. sudo udisksctl power-off -b /dev/sda

Disable "wake on pattern match"

cf: https://superuser.com/questions/560175/what-does-wake-on-pattern-match-option-mean-in-network-card-preferences 

Disable "wake on pattern match" to prevent my vmware on kpchiao9600k to wake up win10 on kpchiaoamd.

 

Rsyslogd: action ‘action-0-builtin:omfile’ ‘action-7builtin:omfile’

cf: https://ubuntu-mate.community/t/rsyslogd-action-action-0-builtin-omfile-resumed-module-builtin-omfile/24105

Edit /etc/rsyslog.conf and comment the following lines.

#
# Set the default permissions for all log files.
#
#$FileOwner syslog
#$FileGroup adm
#$FileCreateMode 0640
#$DirCreateMode 0755
#$Umask 0022
#$PrivDropToUser syslog
#$PrivDropToGroup syslog

Restart rsyslog

 

Set network interface priority

cf: https://forums.raspberrypi.com/viewtopic.php?t=278033  

For linux: 

First run the command:

route -n 

It will show the metrics of the interface. 

Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         192.168.2.1     0.0.0.0         UG    202    0        0 eth1
0.0.0.0         192.168.1.12    0.0.0.0         UG    303    0        0 wlan0
 

The lower the route priority first. So eth0 is higher than wlan0.

Edit /etc/dpchcd.conf: 

interface wlan0 

metric 100 

And run route -n, it will then show:


 

Kernel IP routing table 

Destination Gateway Genmask Flags Metric Ref Use Iface


0.0.0.0 192.168.1.12 0.0.0.0 UG 100 0 0 wlan0 

0.0.0.0 192.168.2.1 0.0.0.0 UG 204 0 0 eth1  

 

Thus, wlan0 will is higher than eth1. 

Becuase wlan0 is the external interface, while eth1 is for internal interface, the wlan0 priority need to be higher than eth1. Otherwise, the outside internet can not be reached. 

 

For windows:

The following image shows the NIC is set to metric 5.