Resize partition and add swap to Ubuntu

resize_partition.sh

# disable swap
sudo swapoff -a

# check space
df -h

# check partitions
lsblk

# recreate partition
sudo fdisk /dev/sda 
p # show table
d # delete
n # new / confirm existing format
a # optional: mark as bootable
w # save

# check partitions
lsblk

# recognize newly available space
resize2fs /dev/sda1

# check space
df -h


# create new swap file
sudo fallocate -l 8G /swapfile

# set permissions
sudo chmod 600 /swapfile

# make it a swapfile
sudo mkswap /swapfile

# activate the swap
sudo swapon /swapfile

# make the swap permanent
sudo nano /etc/fstab

# add this line
/swapfile none swap sw 0 0