Is there a way to install debian wheezy on a i386 computer with efi bios using an USB pendrive and the debian iso? What steps should I follow?
I searched the internet and have not found any clear answers.
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It's possible, but tricky, and filled with pitfalls. I don't recall the precise steps, but it's something along these lines:
I realize this is a very skeletal description; but it's been a while since I've done this, and there are many options and possible variants, so I can't be more precise without putting in at least an hour or two of testing. Also, the last time I tried this, the EFI installation process in Debian was bug-ridden. I hear that it now supports EFI-mode installation on x86-64 systems, so perhaps the current version is better, but you should be wary. The worst of the bugs I encountered was that the installer wiped the EFI System Partition (ESP), thus rendering any previously-installed OS unbootable. Thus, as a precaution, I recommend backing up your ESP before you install Debian in this way.