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I have a comic strip book in cbr (Calibre?) format. How can I convert it to pdf in my Ubuntu 12.04? I tried to install calibre hoping that it is able to do so. But it seems to be buggy and does not show up. Appreciate your hints to do the conversion.

CBR is just a renamed RAR archive containing sequentially numbered images inside. Install UnRAR from the Software Center and extract the archive.

Then using ImageMagick you can convert the images to PDF like so: convert *.jpg out.pdf

If you want a GUI, use gscan2pdf.

Edit: BTW, why do you want to convert? There are great Comic Book Readers apps available on virtually every platform (see here and here for Linux apps), and CBRs/CBZs (renamed ZIP archives) are way better than PDFs.

Calibre has a command-line interface if you're unable to get the GUI to come up for some reason. You can use that to convert.

This manual explains the command line usage and options: http://manual.calibre-ebook.com/cli/ebook-convert.html

Here is some more information on Calibre's E-Book Conversion capabilities:
http://manual.calibre-ebook.com/conversion.html

Aside from Calibre, there aren't many ideal options for e-book conversion. I would try reinstalling Calibre. Ubuntu 12.04 also uses an outdated version of Calibre. The Calibre website recommends installing the latest version from the website, rather than any distro's package management utility. Calibre updates are released every week, including bug fixes, enhancements (especially to the conversion system). The distros are regularly many versions behind. Directions for installing the updated version of Calibre are here: http://calibre-ebook.com/download_linux

Here is a listing of other options for converting ebooks on multiple platforms and multiple platforms. If you can't get Calibre to work, I would suggest trying some of them: http://wiki.mobileread.com/wiki/E-book_conversion

CBR is unrelated to Calibre. It's an archive file for sequential viewing of images. You can read more about that here: http://en.wikipedia.org/wiki/Comic_book_archive

Unfortunately convert and calibre changes the image quality/resolution, which is very important to CBR and CBZ, so to have no loss of quality, practically using the original jpg that is inside the CBR(CBZ) files you need to use img2pdf, I use this commands:

First need to install this:

sudo apt install img2pdf p7zip-full

1) This to make a pdf file out of every jpg image without loss of either resolution or quality:

ls -1 ./*jpg | xargs -L1 -I {} img2pdf {} -o {}.pdf

2) This to concatenate the pdfpages into one:

pdftk *.pdf cat output combined.pdf

I made this batch files

./cbr2pdf.sh:

#!/bin/bash

set -xev

ORIGINAL_FOLDER=`pwd` 

JPEGS=`mktemp -d`

cp "$1" "$JPEGS"

cd "$JPEGS"

7z e "$1" 

ls -1 ./*jpg | xargs -L1 -I {} img2pdf {} -o {}.pdf

pdftk *.pdf cat output combined.pdf

cp "$JPEGS/combined.pdf" "$ORIGINAL_FOLDER/$1.pdf"

cat cbz2pdf.sh

#!/bin/bash

#set -xev

ORIGINAL_FOLDER=`pwd` 

JPEGS=`mktemp -d`

unzip -j "$1" -d "$JPEGS"

cd "$JPEGS"

ls -1 ./*jpg | xargs -L1 -I {} img2pdf {} -o {}.pdf

pdftk *.pdf cat output combined.pdf

cp "$JPEGS/combined.pdf" "$ORIGINAL_FOLDER/$1.pdf"

To convert all cbr and cbz in the folder and subfolders:

tree -fai . | grep -P "cbr$" | xargs -L1 -I{} ./cbr2pdf.sh {}

and

tree -fai . | grep -P "cbz$" | xargs -L1 -I{} ./cbz2pdf.sh {}