Operation Systems – Page 2

Linux

How to fix Attempting to renew cert from /etc/letsencrypt/renewal/example.com.conf produced an unexpected error: Problem binding to port 443: Could not bind to IPv4 or IPv6.. Skipping.

Issue: Attempting to renew cert from /etc/letsencrypt/renewal/example.com.conf produced an unexpected error: Problem binding to port 443: Could not bind to IPv4 or IPv6.. Skipping. How to fix: Just stop webserver before renew letsencrypt. sudo service nginx stop cd letsencrypt sudo ./letsencrypt-auto renew sudo service nginx start

By Igor Khrupin, 7 years7 July, 2017 ago

Mac OS X

Epson XP-103 ink pad counter reset for FREE

My printer has stop working and “paper” and “ink” start blinking. This happens when printer’s ink pads are full From manual: “The printer’s ink pads are nearing or at the end of their service life. Contact Epson Support to replace ink pads. When the printer’s ink pads are nearing the Read more…

By Igor Khrupin, 9 years23 May, 2016 ago

Android Development

Android Loop Tabs Sample

Here is sample for loop tabs in Android. Video with sample application in action Lets show how it works. 1. I have Tab enum which describe Tab element. Also you can handle tab state. I don’t do it in this sample. package com.hrupin.looptabs.infinitetabbar; import com.hrupin.looptabs.R; /** * Created by Igor Read more…

By Igor Khrupin, 9 years3 May, 2016 ago

Mac OS X

VirtualBox. How to connect USB device to guest Windows7 inside host Mac.

There was a problem to connect USB device to hosted Windows7. I always get “Failed to attach USB device to the virtual machine. USB device with UUID is in use by someone else” error. Screenshot: To remove it I did the next: – With the VM powered off, go to Read more…

By Igor Khrupin, 10 years11 December, 2014 ago

Linux

How to fix touchpad scrolling in the Lenovo IdeaPad Z510 under Ubuntu 14.04 LTS

When I’ve updated Ubuntu to 14.04 in Lenovo IdeaPad Z510 laptop then touchpad section disabled from “Mouse and Touchpad” settings (screen below) To fix it you need install a lot of software. I try it but it not works for me. The most fast and simple solution is upgrade linux kernel to Read more…

By Igor Khrupin, 10 years22 November, 2014 ago

Android Development

Useful hotkeys in Android Studio under Mac OS X.

CMD+F12 – Jump to method ALT+ENTER – Quick fix ALT+F7 – Find usage CTRL+SPACE – Code completion CTRL+ALT+L – Reformat code ALT+SHIFT+up/down – Move line up/down Please let me know your favourite hotkeys. I’m awaiting comments from you 😉

By Igor Khrupin, 11 years15 May, 2014 ago

Android Development

How to fix java.lang.VerifyError in Android for ADT-22

I had one problem when migrated to ADT-22. I’ve renamed “lib” dir to “libs” and project compiled. And when I run project on Android device the “java.lang.VerifyError” error crashes my app. In the LogCat I saw that some of classes were rejected by Verifier: “Verifier rejected class …..” And I Read more…

By Igor Khrupin, 12 years30 May, 2013 ago

Android Development

How to change Android SDK path in Android Studio for Mac

Today I want to change default Android SDK path in Android Studio. To change default path to Android SDK you need do the next steps. I describe it via screenshots. 1. Open Android Studio. 2. Configure Android Studio. 3. Click Project Defaults. 4. Cofigure Android SDK path. Click to enlarge. Read more…

By Igor Khrupin, 12 years25 May, 2013 ago

Android Development

Eclipse ADT Rev 22 doesn’t generate R.java

I had this problem when updated to ADT-22 on Eclipse. To fix it you need download NEW additional component from google. This is “Android SDK Build-tools”. Open Your SDK Manager and download it. Restart Eclipse

By Igor Khrupin, 12 years17 May, 2013 ago

Linux

How to fix “Invalid command ‘Header’, perhaps misspelled or defined by a module not included in the server configuration” for apache2 in Ubuntu

If you got: Invalid command ‘Header’, perhaps misspelled or defined by a module not included in the server configuration message in error log of your apache2 web server under Ubuntu you need to do next: Run this command in terminal with sudo Restart Apache2: Also run with sudo

By Igor Khrupin, 13 years7 April, 2012 ago