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netstat -ltp |grep portNo

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First, check to see if you can find out why you can't connect. This command will tell you everything that SSH is trying to do and trying to check when accessing your Linode:

$ ssh -vvv account@your-ip
Then, you can try logging into your Linode with the following SSH command:

$ ssh -o PreferredAuthentications=password -o PubkeyAuthentication=no account@your-ip

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As root, edit /etc/NetworkManager/NetworkManager.conf to match the following. You can use the command sudo nano /etc/NetworkManager/NetworkManager.conf to do so.

[main]
plugins=ifupdown,keyfile

[ifupdown]
managed=true

[keyfile]
unmanaged-devices=*,except:type:wifi,except:type:gsm,except:type:cdma,except:type:wwan,except:type:ethernet,except:type:vlan

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sed -i 's/utf8mb4_0900_ai_ci/utf8_general_ci/g' backup.sql sed -i 's/CHARSET=utf8mb4/CHARSET=utf8/g' backup.sql

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import cv2.cv as cv
import tesseract
gray = cv.LoadImage('captcha.jpeg', cv.CV_LOAD_IMAGE_GRAYSCALE)
cv.Threshold(gray, gray, 231, 255, cv.CV_THRESH_BINARY)
api = tesseract.TessBaseAPI()
api.Init(".","eng",tesseract.OEM_DEFAULT)
api.SetVariable("tessedit_char_whitelist", "0123456789abcdefghijklmnopqrstuvwxyz")
api.SetPageSegMode(tesseract.PSM_SINGLE_WORD)
tesseract.SetCvImage(gray,api)
print api.GetUTF8Text()

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scp -P 22 file.txt remote_username@10.10.0.2:/remote/directory

(first is source file )

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Ubuntu /Debian input devices suddenly stop working?

sudo apt-get install xserver-xorg-input-all

credits: How to Fix Keyboard Not Working After Ubuntu Update

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alter user 'myuser'@'localhost' identified with mysql_native_password by 'mypassword';

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Row(
  children: <Widget>[
     Text('Title'),
     Text(Next title'),
  ]
)

flutter clean
flutter packages get

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<VirtualHost *:80>
      ServerName example.com

      ProxyPreserveHost On
      ProxyPass / http://localhost:3000/
      ProxyPassReverse / http://localhost:3000/
</VirtualHost>


By https://tecadmin.net/apache-frontend-proxy-nodejs/