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VirtualBox report “Kernel driver not installed” on Fedora 21

VitualBox is installed on Fedora 21 by # yum install VirtualBox The following packages are installed kmod-VirtualBox-3.18.7-200.fc21.x86_64-4.3.20-4.fc21.4.x86_64 VirtualBox-4.3.20-3.fc21.x86_64 There is the kernel modules package installed. However, when running virtualbox (after reboot), it reports: [zma@laptop:~]$ virtualbox WARNING: The vboxdrv kernel module is not loaded. Either there is no module available for the current kernel (3.18.7-200.fc21.x86_64) or…

Any good Web browser in command line in Linux?

What suggested web browser in command line? This will be very useful for browsing the Internet from a command line via SSH. You may use Lynx, a fully-featured World Wide Web (WWW) client for users running cursor-addressable, character-cell display devices, in Linux. Homepage: http://lynx.isc.org/ Lynx is a fully-featured World Wide Web (WWW) client for users…

How to get a free Web server SSL/TLS certificates for my websites?

Can I get a non-self-assigned and free Web server SSL/TLS certificates for my https websites? Asking the users to accept the self-assigned SSL certificates for my websites is not very convenient. Please check https://letsencrypt.org/ . PS: StartSSL used to provide 1 year free SSL. But StartCom CA is closed since Jan. 1st, 2018.

How to fix “Your profile could not be opened correctly.” on Linux?

I experience the program on Linux (Fedora 12) that Chrome reports “Your profile could not be opened correctly.” as follows. How to fix it? Restarting Chrome would not help. Removing the ‘Web Data’ directories from all profiles works for me (Making backup first as the commands will remove your files): cd ~/.config/google-chrome find ./ -name…

How to filter RSS feed items?

How to filter RSS items and leave only certain items that I want? Rules may be like: satisfies all or any rules { contains keyword; does not contain keyword } or etc. Two sServices that I find working well for me: Yahoo Piples: https://pipes.yahoo.com/pipes/</s> Pipes is a powerful composition tool to aggregate, manipulate, and mashup…

How to remove AdSense ads for mobile devices while keep them for desktops?

I want to add adsense ads to be shown to visitors on desktop only. How to remove AdSense ads for mobile devices? You can achieve this through using “Responsive ad unit” of AdSense. The support article Create a responsive ad unit from AdSense discusses this and gives an example. Check the “Hiding an ad unit”…

How to download a youtube video to my computer?

How to download a youtube video to my computer? You may use the ClipConverter.cc for downloading Youtube videos: http://www.clipconverter.cc/ How to download a YouTube video: Paste your YouTube URL at ‘Media URL’ and press Continue. Select the format and the options for the conversion. The default options are for most videos a good setting. Press…

Add my own window.onload safely without overwriting old ones

My webpage has one existing window.onload javascript function defined by a javascript plugin in the <head> section. Now, I defined a new one and add it to the end of the HTML page: <script type=”text/javascript”> window.onload = function () { // great work here } </script> I find the new one overwrites the old one…

How to allow pre tag in WordPress comments?

How to allow pre tag in WordPress comments? You can add a filter hook for pre_comment_approved: <?php function filter_handler( $approved , $commentdata ) { // inspect $commentdata to determine approval, disapproval, or spam status return $approved; } add_filter( ‘pre_comment_approved’ , ‘filter_handler’ , ’99’, 2 ); ?> Reference: https://codex.wordpress.org/Plugin_API/Filter_Reference/pre_comment_approved

How to fetch a webpage as a mobile browser with curl on Linux?

On Linux, how to download a webpage as a mobile browser? You can change the agent of curl to be a mobile browser’s and the remote webserver may be consider the request from a mobile browser: curl -A “Mozilla/5.0 (iPhone; CPU iPhone OS 6_1_3 like Mac OS X) AppleWebKit/536.26 (KHTML, like Gecko) CriOS/28.0.1500.12 Mobile/10B329 Safari/8536.25″…