Change Font color and size when booting into CLI ubuntu 20.04 LTS

I was wondering if there was a way to increase font size and change font colour when booting into CLI.
The font is small and white on black, I want it to change the font colour.
If anyone can help, that would be great.
I am ready to provide any system details if needed.
Thanks

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Author: Ammar

AWS LightSail OpenVPN + ASUS RT-3200 – TLS Error: Key negotiation failed

Using https://github.com/angristan/openvpn-install i have installed openvpn on AWS Lightsail Instance (Ubuntu 18.04 LTS). My server config file is as follows:

    port 33434
    proto udp
    dev tun
    user nobody
    group nogroup
    persist-key
    persist-tun
    keepalive 10 120
    topology subnet
    server 10.8.0.0 255.255.255.0
    ifconfig-pool-persist ipp.txt
    push "dhcp-option DNS 8.8.8.8"
    push "dhcp-option DNS 8.8.4.4"
    push "redirect-gateway def1 bypass-dhcp"
    dh dh.pem
    tls-auth tls-auth.key 0
    crl-verify crl.pem
    ca ca.crt
    cert server_VYtknmf1PC80WpTG.crt
    key server_VYtknmf1PC80WpTG.key
    auth SHA512
    cipher AES-256-CBC
    ncp-ciphers AES-256-CBC
    tls-server
    client-config-dir /etc/openvpn/ccd
    status /var/log/openvpn/status.log
    verb 3

And my client.ovpn is as follows:

client
proto udp
explicit-exit-notify
remote 35.173.69.115 33434
dev tun
resolv-retry infinite
nobind
persist-key
persist-tun
remote-cert-tls server
verify-x509-name server_VYtknmf1PC80WpTG name
auth SHA512
auth-nocache
cipher AES-256-CBC
tls-client
setenv opt block-outside-dns # Prevent Windows 10 DNS leak
verb 3

I have added port ‘33434’ UDP in Firewall rule of AWS instance.

I added a new profile in VPN Client section of the asus router and uploaded the client.ovpn file. And clicked activate and get follow message in the log.

May 15 22:29:43 vpnclient1[17419]: NOTE: the current --script-security setting may allow this configuration to call user-defined scripts
May 15 22:29:43 vpnclient1[17419]: Socket Buffers: R=[122880->122880] S=[122880->122880]
May 15 22:29:43 vpnclient1[17419]: UDPv4 link local: [undef]
May 15 22:29:43 vpnclient1[17419]: UDPv4 link remote: [AF_INET]35.173.69.115:33434
May 15 22:29:43 vpnclient1[17419]: TLS: Initial packet from [AF_INET]35.173.69.115:33434, sid=61d9df2d 1f97bdd0
May 15 22:30:02 rc_service: service 17718:notify_rc restart_letsencrypt
May 15 22:30:43 vpnclient1[17419]: TLS Error: TLS key negotiation failed to occur within 60 seconds (check your network connectivity)
May 15 22:30:43 vpnclient1[17419]: TLS Error: TLS handshake failed
May 15 22:30:43 vpnclient1[17419]: SIGUSR1[soft,tls-error] received, process restarting
May 15 22:30:43 vpnclient1[17419]: Restart pause, 2 second(s)

Please suggest how to fix the issue. Thank you.

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Author: Saad Bashir

vi: write relative range of lines to a file

I need to be able to write a range of lines from a file to another file, I’ve found the :<start>,<end>w <new file> solution but what I need is to be able to search for a string and write a a few lines to another file starting at the “found” location. Using .,. works to get one line but what if I want, say, 10 lines? Adding to the complexity is that I want to do this in a script. How do I do that (can I turn on Visual Mode in a script and then move the cursor)?

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Author: Senior Geek

Plotting multiple confusion matrix side by side

I am new here. This is my first question that I hope to get an answer from experts. I have 5 classifier models that I am trying to plot their confusion matrix.

from sklearn.linear_model import LogisticRegression
from sklearn.svm import SVC
from sklearn.neighbors import KNeighborsClassifier
from sklearn.tree import DecisionTreeClassifier
from sklearn.ensemble import RandomForestClassifier
import collections

classifiers = {
    "Naive Bayes": GaussianNB(),
    "LogisiticRegression": LogisticRegression(),
    "KNearest": KNeighborsClassifier(),
    "Support Vector Classifier": SVC(),
    "DecisionTreeClassifier": DecisionTreeClassifier(),
}

and then

from sklearn.metrics import confusion_matrix
for key, classifier in classifiers.items(): 
    y_pred = classifier.fit(X_train, y_train).predict(X_test)
    cf_matrix=confusion_matrix(y_test, y_pred)
    print(cf_matrix)

which gives me

This

now I am trying to plot them with below code but no data is shown on the plots.

fig, axn = plt.subplots(1,5, sharex=True, sharey=True)
cbar_ax = fig.add_axes([.91, .3, .03, .4])

for i, ax in enumerate(axn.flat):
    sns.heatmap(cf_matrix, ax=ax,
                cbar=i == 0,
                vmin=0, vmax=1,
                cbar_ax=None if i else cbar_ax)

fig.tight_layout(rect=[0, 0, .9, 1])

Here is how it looks like

Can someone please help me get this done?

Regards,
Hadi

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Author: hadi0815

MongoDB query to try multiple cases using aggregate, $group, $switch…returning error Unrecognized pipeline stage name: ‘$switch’

Using MongoDB aggregate to see if a first field and/or a second field have value(s), and if so, to increment the NumberMatches by either 1 or 2 (depending on whether one or both exampleA and exampleB have values), and to increment MatchesTotal by the values of exampleA/exampleB. I am using Mongo’s $switch, as with this example from Stack Overflow, and $group.

However, I am getting the error message Unrecognized pipeline stage name: '$switch'. Right now the $switch is outside of $group. Previously I had tried using the $switch within MongoDB $group to try the query, but got another error message unknown group operator '$switch'. How can I use $switch and $group together in order to do this incrementation/sum ternary query in MongoDB?

$switch query with $group inside:

db.examples.aggregate([
  {
    "$match": {
      $or : [
        { 
          $and : [ 
            {"exampleField.exampleA": {$type: 16}},
            {"exampleField.exampleB": { $type: 16 }}
          ]
        },
        { 
          "exampleField.exampleA": {$type: 16}
        },
        { 
          "exampleField.exampleB": {$type: 16}
        }               
      ]
    }
  },    
  {
    $switch: {
      "branches": [
        { "case": 
          { "$eq": [ "$exampleField.exampleA", null ] }, 
          "then": { 
            $group: {
              _id: null,
              NumberMatches: { $sum: 1 },
              MatchesTotal: { $sum: "exampleField.exampleB" }
            }
          }
        },
        { "case": { 
          "$eq": [ "exampleField.exampleB", null ] }, 
          "then": {     
            $group: {
              _id: null,
              NumberMatches: { $sum: 1 },
              MatchesTotal: { $sum: "$exampleField.exampleA" }
            } 
          }
        }
      ],
      "default": {     
        $group: {
          _id: null,
          NumberMatches: { $sum: 2 },
          MatchesTotal: { $sum: "$exampleField.exampleA" + "exampleField.exampleB" }
        } 
      }      
    }     
  },  
]).forEach( function(myDoc) { print( myDoc) } );

Alternate $group query with $switch inside (also didn’t work):

$group: {
  _id: null,

  NumberMatches: {
      $switch: {
          "branches": [
              { "case": { "$eq": [ "$exampleField.exampleA", null ] }, "then": { $sum: 1 } },
              { "case": { "$eq": [ "exampleField.exampleB", null ] }, "then": { $sum: 1 } }
            ],
        "default": { $sum: 2 }

      }

  },      
  MatchesTotal: { $sum: "$exampleField.exampleA" + "$exampleField.exampleB" }
}

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Author: maudulus

Trying to upgrade to a new release version, having trouble with /etc/apt/sources.list

I am trying to upgrade to a new release version following the instructions of the accepted answer here.

Someone mentioned in the comments section of the OP’s question that you should change http://old-releases.ubuntu.com/ubuntu/ to http://us.archive.ubuntu.com/ubuntu/
so that’s what I did. The current state of my sources.list file is as shown below.

When I try to run sudo apt-get update && sudo apt-get dist-upgrade, I get

Ign:1 http://us.archive.ubuntu.com/ubuntu disco InRelease
Hit:2 http://packages.microsoft.com/repos/vscode stable InRelease                                                            
Ign:3 http://us.archive.ubuntu.com/ubuntu disco-updates InRelease                                                            
Hit:4 http://dl.google.com/linux/chrome/deb stable InRelease                              
Hit:5 https://repo.skype.com/deb stable InRelease                                         
Ign:6 http://us.archive.ubuntu.com/ubuntu disco-backports InRelease                       
Hit:7 http://ppa.launchpad.net/bit-team/stable/ubuntu disco InRelease
Ign:8 http://us.archive.ubuntu.com/ubuntu disco-security InRelease
Err:9 http://us.archive.ubuntu.com/ubuntu disco Release                            
  404  Not Found [IP: 91.189.91.39 80]
Err:10 http://us.archive.ubuntu.com/ubuntu disco-updates Release                   
  404  Not Found [IP: 91.189.91.39 80]
Err:11 http://us.archive.ubuntu.com/ubuntu disco-backports Release
  404  Not Found [IP: 91.189.91.39 80]
Err:12 http://us.archive.ubuntu.com/ubuntu disco-security Release
  404  Not Found [IP: 91.189.91.39 80]
Ign:13 http://ppa.launchpad.net/pmcenery/ppa/ubuntu disco InRelease
Err:14 http://ppa.launchpad.net/pmcenery/ppa/ubuntu disco Release
  404  Not Found [IP: 2001:67c:1560:8008::15 80]
Reading package lists... Done
E: The repository 'http://us.archive.ubuntu.com/ubuntu disco Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: The repository 'http://us.archive.ubuntu.com/ubuntu disco-updates Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: The repository 'http://us.archive.ubuntu.com/ubuntu disco-backports Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: The repository 'http://us.archive.ubuntu.com/ubuntu disco-security Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: The repository 'http://ppa.launchpad.net/pmcenery/ppa/ubuntu disco Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.

What should I do?

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Author: An Ignorant Wanderer

Install driver rtl8814au on ubuntu 20.04

Based on this

Install driver rtl8814au on ubuntu 18.04

I installed manually (make && make install) the driver when I had the kernel

$ uname -r
5.4.0-26-generic

Now, ubuntu 20.04 wants to install the new one:

linux-image-5.4.0-29-generic

I did it before (upgrade the system then, the kernel) and the driver stopped to work, even I installed thousand times, was impossible to up the driver which logical name is “wlx50c4ddcf488e”.

The installation I made:

$ sudo apt install build-essential
$ sudo apt install bc
$ sudo apt install linux-headers-`uname -r`
$ sudo apt install git

$ git clone https://github.com/aircrack-ng/rtl8812au.git

$ cd rtl8812au
$ make && sudo make install

Does anyone has idea about what can I do? Now, I cannot upgrade my system without losing the wireless connection.

Thank a lot.

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Author: Ibringpies

Busy Bee

Been a busy bee,

Have not made strides to revamp,

I post another.

In the meantime, head over to https://www.JoseYamut.xyz.

Hello World!

Revamping this website.

More to come soon.

Stay tuned!

In the meantime, head over to https://www.JoseYamut.xyz.