After removal of the first primary partition, you might notice, that the names of the remaining partitions didn't
/dev/sda2. To renumber the partition, use
fdisk and create a new primary partition no. 1
which is located behind
sda2. You might want to delete your swap partition, create a new one in partition slot no. 1.
Now enter the expert menu of fdisk and type f to fix the partition table. The partitions will be renumbered according to their position on disk. After that delete the temporary partition and re-create your swap. Don't forget to write the new partition table to disk.
Afterwards, update your
/etc/fstab and do a