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$ sudo -v && wget -nv -O- | sudo sh /dev/stdin
[sudo] password for brb: 
2019-07-21 10:36:31 URL: [31301/31301] -> "-" [1]
Using python executable: /usr/bin/python3
Installing to /opt/calibre
Downloading tarball signature securely...
Will download and install calibre-3.46.0-x86_64.txz 
                                         Downloading calibre-3.46.0-x86_64.txz                                          
100% [==============================================================================================================]
                                                                                            Downloaded 62459384 bytes 
Checking downloaded file integrity... 
Extracting files to /opt/calibre ...
Extracting application files... 
Creating symlinks...
	Symlinking /opt/calibre/lrfviewer to /usr/bin/lrfviewer
	Symlinking /opt/calibre/calibre-smtp to /usr/bin/calibre-smtp
	Symlinking /opt/calibre/ebook-polish to /usr/bin/ebook-polish
	Symlinking /opt/calibre/ebook-device to /usr/bin/ebook-device
	Symlinking /opt/calibre/lrs2lrf to /usr/bin/lrs2lrf
	Symlinking /opt/calibre/calibre-parallel to /usr/bin/calibre-parallel
	Symlinking /opt/calibre/fetch-ebook-metadata to /usr/bin/fetch-ebook-metadata
	Symlinking /opt/calibre/calibredb to /usr/bin/calibredb
	Symlinking /opt/calibre/calibre-customize to /usr/bin/calibre-customize
	Symlinking /opt/calibre/lrf2lrs to /usr/bin/lrf2lrs
	Symlinking /opt/calibre/ebook-viewer to /usr/bin/ebook-viewer
	Symlinking /opt/calibre/markdown-calibre to /usr/bin/markdown-calibre
	Symlinking /opt/calibre/calibre to /usr/bin/calibre
	Symlinking /opt/calibre/ebook-meta to /usr/bin/ebook-meta
	Symlinking /opt/calibre/web2disk to /usr/bin/web2disk
	Symlinking /opt/calibre/ebook-edit to /usr/bin/ebook-edit
	Symlinking /opt/calibre/calibre-server to /usr/bin/calibre-server
	Symlinking /opt/calibre/calibre-debug to /usr/bin/calibre-debug
	Symlinking /opt/calibre/ebook-convert to /usr/bin/ebook-convert
Setting up command-line completion...
Installing zsh completion to: /usr/share/zsh/vendor-completions/_calibre
Installing bash completion to: /usr/share/bash-completion/completions/calibre
Setting up desktop integration...
Creating un-installer: /usr/bin/calibre-uninstall
Run "calibre" to start calibre

By default, your books are saved in $HOME/Calibre Library folder.


  • "-nv" means non-verbose output
  • "-O-" means output to stdout. It is the same as "-O -". See what is -O- option means for wget? The dash "-" means standard input or standard output (this case). See here or Download and Un-tar(Extract) in One Step.
  • As we can see from the screen message when we run the command again, it ( will not download the file again. In fact the file is saved under /tmp/calibre-installer-cache/.
$ ls -lth /tmp/calibre-installer-cache/
total 60M
-rw-r--r-- 1 root root 60M Jul 21 10:35 calibre-3.46.0-x86_64.txz
-rw-r--r-- 1 root root 128 Jul 21 10:35 calibre-3.46.0-x86_64.txz.signature
  • when we include sudo -v at the beginning, it will prompt us to enter the sudo password immediately. However, if we don't have sudo -v at the beginning, the prompt stays at a strange location when it is asking the sudo password.
$ wget -nv -O- | sudo sh /dev/stdin
[sudo] password for brb: 2019-07-21 10:35:41 URL: [31301/31301] -> "-" [1]

Using python executable: /usr/bin/python3


The interface is very wide. The preferences button is positioned at the far right.


Error on Ubuntu 20.04.1

$ calibre
qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

Available platform plugins are: eglfs, linuxfb, minimal, minimalegl, offscreen, vnc, wayland-egl, wayland, wayland-xcomposite-egl, wayland-xcomposite-glx, xcb.

Aborted (core dumped)

Calibre 5.0.1 Could not load the Qt platform plugin "xcb" FIXED. After I installed just one missing component libxcb-xinerama0, then it works.



Create ebooks

Fetch News and recipes

Some RSS feeds

Builtin feeds that do not work

  • US and World Report news
  • Wired Magazine (monthly ed)
  • Discover Magazine

The recipes files (*.recipe) and the <index.json> file are saved in $HOME/.config/calibre/custom_recipes. They can be loaded through 'Add custom news source' dialog. So backing up the ~/'Calibre Library' does not include the custom recipes.


  • Calibre will show the file size for each title/recipe. If the title is too large, send to kindle may not work (>40MB not work but 27MB works)
  • If we have multiple files to send, it will wait 301 seconds before sending for the 2nd one, to avoid being marked as spam. You can control this delay via Preferences->Tweaks
  • Each recipe has two parameters: oldest article (how many days) and max # of articles per feed (default is 100). Since all recipes are scheduled to download every day, I can set 1 day for the oldest article.

A commercial service Keendly does it for a fee.

Autostart Calibre after a reboot

Two steps:

  1. Automatic login desktop
  2. Autostart a program after logging into your desktop

Remove a schedule download

Check the checkbox 'Schedule for download' at the top of source.

Some news source

Command line

ebook-convert ~/.config/calibre/custom_recipes/(your recipe) test.epub --test -v -v

ebook-convert myrecipe.recipe test.epub --test -vv


  • Install a copy of Calibre on my local computer. Import the recipe files downloaded from the remote server.
  • Enable VNC on the remote server. Or run Calibre on my local computer.



Delete mails from gmail

It seems the mails sent through gmail to kindle took space. To reclaim the space in gmail,

  • Go to to confirm the current space used by gmail
  • Go to gmail. Search 'calibre'. Select all checkbox. Select all XXX conversations. Delete
  • Go to gmail -> Trash. Select all checkbox. Select all XXX conversations in Trash. Delete forever.
  • Go to to confirm the current space used by gmail

ebook format

  • pobi: this is a Kindle Store Magazine Ebook Format when Calibre generated and sent is to my Kindle. POBI is a variation of MOBI and enables the display of articles and sections in periodical content. NOTE: If you change the POBI extension to MOBI then the Sections & Articles index of the magazine will not appear.
  • azw3: this is the format for the books I purchase from Amazon, or using the browser extension to send it to my kindle

Recommended books

5 AI-Powered Book Recommendation Sites and Apps to Find Your Next Read. Sona is cool!

Get books

How to turn a Raspberry Pi into an eBook server

Remove DRM from Ebooks

Play Books

How to Download Book Purchased from Google Books to Read Offline PDF without DRM

Calibre Ebook Server for transferring files/read on browser

  • http://IP:8080. The port number can be changed by Preferences - Sharing over the net.
  • Ubuntu 14.04
  • How to Install Calibre Ebook Server on Ubuntu 22.04
  • Calibre Tutorial: Transfer E-books to Kindle through Local Wireless Transmission
  • On Ubuntu 20.04 & calibre 5.44
    $ which calibre
    $ which calibre-server
    $ ps -ef | grep calibre
    /opt/calibre/bin/calibre --detach
    /opt/calibre/bin/calibre-parallel --pipe-worker from calibre.utils.ipc.pool import run_main, worker_main; run_main(27, worker_main)
  • Read it on browser: Left/right swipe on a single article. Up/down swipe to change articles. However, the control is not responsive. No way to go back. Downloading the files and use the mobile apps to read files is probably better.
  • Preferences - Behavior - uncheck 'Automatically send downloaded news to e-book reader'. Preferences - Sharing - Sharing books by email - uncheck "Auto send"
  • My workflow is choose "epub" as the output format. On My Android e-ink device, I use a browser to download files via the Calibre-server web service. Finally I'll open the epub file by Moon+ Reader.
  • We can start calibre-server automatically when the desktop is launched. Preferences - Sharing over the net - Main - check Run server automatically when calibre starts
  • Docker

Moon+ Reader

  • How to connect to my Calibre OPDS server?
  • Using Moon+ Reader is better than FF browser b/c for some reason FF cannot refresh the Calibre web server page.
  • On Onyx eReader, after I select a book, Left=Download, Right=Open.
  • Options - Main Folder. If I try to modify it, the screen will show the current folder (Left=Cancerl, Right=OK).
    • /sdcard/Download on Onyx Note Air. It's actually /sdcard/Download/MoonReader. But on Onyx, it does not show files with folder structures. So all files are listed there.
    • /sdcard/Books on phone. It's actually /sdcard/Books/MoonReader/.

Quit/Exit Full Screen mode on a tablet It's not working. I have to quit the browser.

Alternative ebook reader

RSS reader


RSS Guard

RSS Guard Is A Qt Desktop RSS Feed Reader With Support For Syncing With Feedly, Google Reader API, More

TICKR: live scrolling text line

Browser Addon

Feedbro - RSS Feed Reader. It works; for example, tested on I can use 'j' and 'k' to navigate. 'v' to view the item in a new window. Change the view mode is cool.


Vivaldi has a built-in RSS reader and mail reader.

Fluent reader

Create RSS feeds

RSS and torrents

How to Use RSS Feeds to Download Torrents Automatically

RSS and youtube channel

How to Get an RSS Feed for a YouTube Channel

Send/Push to kindle

Desktop Publishing Software

The 10 Best Desktop Publishing Software for Document Layout Design


Design a book cover with an open source alternative to InDesign

ebook store

Where to Buy Ebooks: 10 Online Ebook Stores Worth Using


Audio books