[sagher]

The code above tells us that you only have 4.8 GiB!! I took a quick look at the code and it's:

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# total disk size is calculated by adding all partitions of the types listed below (after the -t flags)
TOTAL_DISK=$(df -t simfs -t ext2 -t ext3 -t ext4 -t btrfs -t xfs -t vfat -t ntfs -t swap --total -h | grep total | awk '{ print $2 }')
echo -e "Disk       : $TOTAL_DISK"

So just to make sure of this, can you please post the output of these two commands run as root:

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lsblk

and

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df -Th

thanks!

lsblk :

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NAME   MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
sr0     11:0    1 1024M  0 rom
vda    254:0    0    5G  0 disk
├─vda1 254:1    0    5G  0 part /
└─vda2 254:2    0   32M  0 part [SWAP]

df -Th :

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Filesystem     Type      Size  Used Avail Use% Mounted on
udev           devtmpfs  3.9G     0  3.9G   0% /dev
tmpfs          tmpfs     799M   51M  749M   7% /run
/dev/vda1      ext3      4.9G  1.4G  3.4G  29% /
tmpfs          tmpfs     4.0G     0  4.0G   0% /dev/shm
tmpfs          tmpfs     5.0M     0  5.0M   0% /run/lock
tmpfs          tmpfs     4.0G     0  4.0G   0% /sys/fs/cgroup
tmpfs          tmpfs     799M     0  799M   0% /run/user/0