Philip Rego's questions

Whenever I restart my computer NetworkManager sets /etc/resolv.conf to this, my DNS stops working and I get this error in Chrome.

/etc/resolv.conf

# Generated by NetworkManager
search tampabay.rr.com
nameserver 127.0.0.53

Chrome error:

DNS_PROBE_FINISHED_NO_INTERNET

I temporarily resolve the issue by setting /etc/resolv.conf to this.

/etc/resolv.conf

nameserver 8.8.8.8

I'm guessing NetworkManager expects a DNS server on my local machine at 127.0.0.53, and I don't have DNS running there. How can I permanetly set 8.8.8.8 as my nameserver? If it's really neccessary how do I setup DNS at 127.0.0.53?

I read man resolv.conf but it didn't help me much.

I read this answer and created the file /etc/resolvconf/resolv.conf.d/tail with nameserver 8.8.8.8 but it doesn't seem to have any effect: DNS set to systemd's 127.0.0.53 - how to change permanently?

Edit: Ubuntu 20.04 LTS

The DNS cache program unbound was running on port :53 and preventing dnsmasq from starting. I uninstalled unbound and dnsmasq starts now. However it's saying it's only running on 0.0.0.0 for some reason. I figure it has to be running on 127.0.0.1:53. I reinstalled dnsmasq but it's acting the same. /etc/dnsmasq.conf is all commeted out. On restart /etc/resolv.conf is now set to

# Generated by resolvconf
nameserver 127.0.0.1

Not sure how to get dnsmasq running properly.

/lib/systemd/system/dnsmasq.service

[Unit]
Description=dnsmasq - A lightweight DHCP and caching DNS server
Requires=network.target
Wants=nss-lookup.target
Before=nss-lookup.target
After=network.target

[Service]
Type=forking
PIDFile=/run/dnsmasq/dnsmasq.pid

# Test the config file and refuse starting if it is not valid.
ExecStartPre=/usr/sbin/dnsmasq --test

# We run dnsmasq via the /etc/init.d/dnsmasq script which acts as a
# wrapper picking up extra configuration files and then execs dnsmasq
# itself, when called with the "systemd-exec" function.
ExecStart=/etc/init.d/dnsmasq systemd-exec

# The systemd-*-resolvconf functions configure (and deconfigure)
# resolvconf to work with the dnsmasq DNS server. They're called like
# this to get correct error handling (ie don't start-resolvconf if the 
# dnsmasq daemon fails to start.
ExecStartPost=/etc/init.d/dnsmasq systemd-start-resolvconf
ExecStop=/etc/init.d/dnsmasq systemd-stop-resolvconf


ExecReload=/bin/kill -HUP $MAINPID

[Install]
WantedBy=multi-user.target

journalctl -e --unit dnsmasq.service

-- Reboot --
Jul 08 23:41:54 phil-desktopubuntu-18-04-1-lts systemd[1]: Starting dnsmasq - A lightweight DHCP and caching DNS server...
Jul 08 23:41:54 phil-desktopubuntu-18-04-1-lts dnsmasq[7349]: dnsmasq: syntax check OK.
Jul 08 23:41:54 phil-desktopubuntu-18-04-1-lts dnsmasq[7369]: started, version 2.80 cachesize 150
Jul 08 23:41:54 phil-desktopubuntu-18-04-1-lts dnsmasq[7369]: DNS service limited to local subnets
Jul 08 23:41:54 phil-desktopubuntu-18-04-1-lts dnsmasq[7369]: compile time options: IPv6 GNU-getopt DBus i18n IDN DHCP DHCPv6 no-Lua TFTP conntrack ipset auth DNSSEC loop-detect inotify dumpfile
Jul 08 23:41:54 phil-desktopubuntu-18-04-1-lts dnsmasq[7369]: read /etc/hosts - 7 addresses
Jul 08 23:41:54 phil-desktopubuntu-18-04-1-lts dnsmasq[7369]: no servers found in /run/dnsmasq/resolv.conf, will retry
Jul 08 23:41:54 phil-desktopubuntu-18-04-1-lts systemd[1]: Started dnsmasq - A lightweight DHCP and caching DNS server.

It's always so bright. How do you dim it so it's not hurting your eyes.

I'm connecting to a corporate internet for the first time using an Ethernet cable. The connection works for everyone else, but not my Ubuntu 19.1 laptop.

After troubleshooting, there doesn't seem to be any issue with DNS since my laptop resolves the domains and I can access these IP addresses on my phone. I can't ping any website with either the IP address or domain name from my laptop. I am able to ping the default route.

$ host google.com
google.com has address 64.233.185.102
google.com has address 64.233.185.138
google.com has address 64.233.185.113
google.com has address 64.233.185.139
google.com has address 64.233.185.100
google.com has address 64.233.185.101
google.com has IPv6 address 2607:f8b0:4002:c09::64
google.com mail is handled by 40 alt3.aspmx.l.google.com.
google.com mail is handled by 30 alt2.aspmx.l.google.com.
google.com mail is handled by 50 alt4.aspmx.l.google.com.
google.com mail is handled by 20 alt1.aspmx.l.google.com.
google.com mail is handled by 10 aspmx.l.google.com.

$ ping 72.30.35.10
PING 72.30.35.10 (72.30.35.10) 56(84) bytes of data.

--- 72.30.35.10 ping statistics ---
164 packets transmitted, 0 received, 100% packet loss, time 166900ms

$ network-test
INFO: This system has exactly one default route
INFO: Host localhost answers to ICMP pings
INFO: Loopback interface is working properly
INFO: The enp0s31f6 interface is up
INFO: The enp0s31f6 interface has IP address 10.248.19.128 assigned
INFO: The enp0s31f6 interface has tx and rx packets.
WARN: The wlp4s0 interface is down
INFO: The router 10.248.19.11 is reachable
INFO: This system is configured to use nameserver 127.0.0.53
INFO: Host 127.0.0.53 answers to ICMP pings
INFO: Dns server 127.0.0.53 resolved correctly www.debian.org
INFO: The nameserver configured for this system works properly
WARN: System does not seem to reach Internet host www.debian.org through ICMP
ERR: Cannot access web server at Internet host www.debian.org (port 80)

$ ping 10.248.19.11
PING 10.248.19.11 (10.248.19.11) 56(84) bytes of data.
64 bytes from 10.248.19.11: icmp_seq=1 ttl=255 time=1.09 ms
64 bytes from 10.248.19.11: icmp_seq=2 ttl=255 time=1.28 ms
64 bytes from 10.248.19.11: icmp_seq=3 ttl=255 time=1.61 ms
64 bytes from 10.248.19.11: icmp_seq=4 ttl=255 time=0.918 ms

> 2: enp0s31f6: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc
> fq_codel state UP group default qlen 1000
>     link/ether 12:0a:57:4c:e7:13 brd ff:ff:ff:ff:ff:ff
>     inet 10.248.19.128/24 brd 10.248.19.255 scope global dynamic noprefixroute enp0s31f6
>        valid_lft 86104sec preferred_lft 86104sec
>     inet6 fe80::9f93:f86b:b5c4:b9b5/64 scope link noprefixroute 
>        valid_lft forever preferred_lft forever

What additional troubleshooting steps can I perform to identify why I can't ping websites?

 $sudo lshw -C network
  *-network DISABLED        
       description: Wireless interface
       product: Wireless 8260
       vendor: Intel Corporation
       physical id: 0
       bus info: pci@0000:04:00.0
       logical name: wlp4s0
       version: 3a
       serial: a4:34:d9:bc:64:de
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
       configuration: broadcast=yes driver=iwlwifi driverversion=5.3.0-40-generic firmware=36.77d01142.0 latency=0 link=no multicast=yes wireless=IEEE 802.11
       resources: irq:128 memory:f1000000-f1001fff
  *-network
       description: Ethernet interface
       product: Ethernet Connection I219-LM
       vendor: Intel Corporation
       physical id: 1f.6
       bus info: pci@0000:00:1f.6
       logical name: enp0s31f6
       version: 21
       serial: 12:0a:57:4c:e7:13
       size: 100Mbit/s
       capacity: 1Gbit/s
       width: 32 bits
       clock: 33MHz
       capabilities: pm msi bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=e1000e driverversion=3.2.6-k duplex=full firmware=0.13-3 ip=10.248.3.104 latency=0 link=yes multicast=yes port=twisted pair speed=100Mbit/s
       resources: irq:124 memory:f1200000-f121ffff

$ host www.ebay.com
www.ebay.com is an alias for slot9428.ebay.com.edgekey.net.
slot9428.ebay.com.edgekey.net is an alias for e9428.b.akamaiedge.net.
e9428.b.akamaiedge.net has address 72.246.253.92

$ ping -c 5 8.8.8.8 PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.

--- 8.8.8.8 ping statistics --- 5 packets transmitted, 0 received, 100% packet loss, time 4104ms

I never had issues with wireless. Connected to my phones internet now.

I reinstalled my graphics card driver and now I can't dim the screen anymore on my desktop.

When I use this https://github.com/sidneys/desktop-dimmer/releases it prevents me from clicking on the dock and top toolbar. I have to kill it from the terminal to stop it.

This doesn't adjust anything. https://github.com/Fushko/gammy Not working in Ubuntu 18:

Not working in 19.1:

$ xrandr -q
Screen 0: minimum 16 x 16, current 1920 x 1080, maximum 32767 x 32767
XWAYLAND0 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 510mm x 290mm
1920x1080 59.96*+

/sys/class/backlight directory is empty

I have an old external hard drive that is recognized by Ubuntu but doesn't show the files (just one empty folder and I can't create anything on it)

I went through this, and was able to create an image of the drive with ddrescue.Then using formost on the image file I was able to recover most of my files. https://help.ubuntu.com/community/DataRecovery

However formost doesn't recover .txt files. I also tried Magic Rescue and ntfsundelete which didn't work. Any idea how I can recover txt files from this image or damaged external hard drive?

$ mmls image 
Cannot determine partition type

I'm running a Spring Boot App with Eclispe and I'd like to know what command or script Eclipse is using to run it. When it starts it only shows the spring boot output.

I'd also like Eclipse to show how other projects are run not only spring boot. Maybe there's a setting to enable this or a log file somewhere that would show it.

Console output:

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v1.2.3.RELEASE)

2019-08-31 14:25:42.106  INFO 32045 --- [           main] be.heydari.seed.Application 
...

I want to easily set an alias git-go to this terminal line:

git commit -m "init "; git push; git status

So when I enter git-go this line should enter.

How can I do that? The answers I seen only cover alias of a command without parameters. But I want to set an alias to an arbitrary terminal line.

Edit: I've learned to use functions instead of aliases because

The rules concerning the definition and use of aliases are somewhat confusing.

and

For almost every purpose, shell functions are preferred over aliases.

So don't use an alias unless you have to. https://ss64.com/bash/alias.html

When I highlight copy in the terminal I can paste with shift+insert. But when I press shift insert in google chrome it gives different output. How do you get it to copy globally?

I have this path I want to navigate to in the UI. /usr/local/sbin

How can I do that with a couple clicks in the UI?

Often Files shows the path as a dropdown. How can I select the path so I can copy it?

Ubuntu seemed to install correctly. When the VM starts some seemingly benign text appears on the screen and then goes to the splash screen. After the splash screen it goes to a completely black screen. I'm using the latest ubuntu and oracle vm. My vm is set to linux 32bit.

What I've tried: Reinstalling Ubuntu, Adjusting screen resolution, Hard/Soft reset (underscore appears and shutdown during soft reset)

Ubuntu version: ubuntu-16.10-desktop-i386 Oracle VM: 5.1.10