Did this with Gentoo for a decade, even across two computer changes. boot into a rescue disk, set up grub, then for each partition do ssh oldcomputer "gzip</dev

Did this with Gentoo for a decade, even across two computer changes. boot into a rescue disk, set up grub, then for each partition do ssh oldcomputer "gzip</dev/sda5"|zcat>/dev/sda5, then resize the fs.