Please
do read the install documentation provided first. It will save a lot of time and prevent the duplication of the basic questions/answers.
** NOTE: some people are reporting installer-script syntax errors when using various shells. Until I make some changes to make the shell-script more "portable," try explicitly using a bash shell to launch the installer.
Code:
bash ./Sigil-v0.9.8-Linux-x86.xz.run
Using the skiplibctest argument as described in the
trouble-shooting section of the INSTALL documentation (if you're certain your libc is recent enough) may work around the issue as well.