First stage before updating

First, update your Ubuntu

apt upgrade

Then restart your server

reboot

Next, do the following:

apt update && sudo apt upgrade -y

After that, you need to remove unused packages and kernels to free up space in your /boot partition

apt --purge autoremove

Then you need to edit the update manager configuration file. This can be done as follows:

nano /etc/update-manager/release-upgrades

Find the line starting with Prompt =. Make sure it is not commented out and the lts value matches the one shown:

Prompt=lts

Running Updates

First, we recommend checking the backups again. Then run the update tool on your Ubuntu, then enter Y

do-release-upgrade

Then follow the instructions that you see in your terminal and click carefully. This will be followed by the removal of packages, with which you must agree by clicking on Y

Checking Your Python Version

In order to go to upgrade your python, you need to check its version. This can be done using the following command:

python3 -V

If python is successfully installed on your server, then you should get something like this:

Python 3.6.7

Updating your Python Version

First, you need to install the required dependencies to compile the Python source code. This can be done using a special command, which is presented below:

yum groupinstall 'development tools' -y && yum install wget openssl-devel bzip2-devel libffi-devel xz-devel -y

After that, we recommend going to the Python source download page to find the latest gzip version of the source code. Replace the urls and filenames in this tutorial with the latest version. Then download your python

wget https://www.python.org/ftp/python/3.9.6/Python-3.9.6.tgz

After that, you need to unpack the archive that you just downloaded. You can do it like this:

tar xzf Python-3.9.6.tgz

Next, compile the Python source

cd Python-3.9.6 && ./configure --enable-optimizations

This is followed by the installation of your Python. Use the following command:

make altinstall

After that, a mandatory step for execution will be to check the name of your new Python executable file

ls /usr/local/bin/python*

Then Install the new default Python executable. Replace the two instances of /python3.9 in the following command with the name of your new Python executable

alternatives --install /usr/bin/python3 python3 /usr/local/bin/python3.9 1 && alternatives --set python3 /usr/local/bin/python3.9 && echo "2" | alternatives --config python

Update your PIP

An important step for this update is to update your pip.

/usr/local/bin/python3.9 -m pip install --upgrade pip

Then you should check the name of your new pip executable

ls /usr/local/bin/pip*

Set the new item as default. Use the name of your new pip executable in the following command:

alternatives --install /usr/bin/pip pip /usr/local/bin/pip3.9 1 && alternatives --set pip /usr/local/bin/pip3.9

After that, you need to check the current version of your installed Python. You can make sure like this:

python -V && pip -V

After that, you will be able to see the following:

Python-3.9.6
pip 21.2.3 from /usr/local/lib/python3.9/site-packages/pip (python 3.9)

Checking Your Python Version

In order to go to upgrade your python, you need to check its version. This can be done using the following command:

python3 -V

If python is successfully installed on your server, then you should get something like this:

Python 3.6.7

Updating your Python Version

First, you need to install the required dependencies to compile the Python source code. This can be done using a special command, which is presented below:

# apt-get install wget build-essential libreadline-gplv2-dev libncursesw5-dev libssl-dev libsqlite3-dev tk-dev libgdbm-dev libc6-dev libbz2-dev libffi-dev zlib1g-dev liblzma-dev -y

After that, we recommend going to the Python source download page to find the latest gzip version of the source code. Replace the urls and filenames in this tutorial with the latest version. Then download your python

wget https://www.python.org/ftp/python/3.9.6/Python-3.9.6.tgz

After that, you need to unpack the archive that you just downloaded. You can do it like this:

tar xzf Python-3.9.6.tgz

Next, compile the Python source

cd Python-3.9.6 && ./configure --enable-optimizations

This is followed by the installation of your Python. Use the following command:

make altinstall

After that, a mandatory step for execution will be to check the name of your new Python executable file

ls /usr/local/bin/python*

Then Install the new default Python executable. Replace the two instances of /python3.9 in the following command with the name of your new Python executable

update-alternatives --install /usr/bin/python python /usr/local/bin/python3.9 1

Update your PIP

An important step for this update is to update your pip.

/usr/local/bin/python3.9 -m pip install --upgrade pip

Then you should check the name of your new pip executable

ls /usr/local/bin/pip*

Set the new item as default. Use the name of your new pip executable in the following command:

update-alternatives --install /usr/bin/pip pip /usr/local/bin/pip3.9 1

After that, you need to check the current version of your installed Python. You can make sure like this:

python -V && pip -V

After that, you will be able to see the following:

Python-3.9.6
pip 21.2.3 from /usr/local/lib/python3.9/site-packages/pip (python 3.9)

Grown the partition and File System

For the following file systems: xfs, ext4, btrfs, ntfs (for Windows, starting from Vista) is possible to growth online (i.e. without unmounting before proceeding). Ntfs and btrfs even can shrink online, other file systems only then aren’t mounted).

First of all, you need the root access to your VPS server. After login, you need to run the lsblk command. Here you can see all disk devices, their volume, and partitions. In this screenshot, you can see that vda has a size of 50 GB, and in this case, vda1 + vda2 have 30 GB. After that, please enter the parted /dev/vda

As we can see, the command parted is run. Next, we run the command – p (Print), which shows the partitions and offers to change/fix the GPT table so that it matches the size of the virtual disk.
We agree – we write: Fix

After that, we need to run resizepart 2 – this is the command that marks the resize of the partition. You can take the final number from the size of the disk – the size can be seen on screen 2 – 53, 7GB

Finally, you need to use the q command – it exits parted. For the ext3 / ext4 filesystem format, the following command: resize2fs /dev/vda2

Done! At this stage, the changes are complete.

For xfs, you can use the command: xfs_growfs

For btrfs, you can use the command: btrfs filesystem resize

For ext4, you can use the command: resize2fs /dev/vda2

Preparation

The important point is that you need to backup your virtual server. On its own, Debian is very stable; but there is always a degree of probability that potential incompatibility will arise.
Still important is the presence of broken packages. This can be done with dpkg –audit. If this does not help, you can try to fix the problem with apt -f install or dpkg –configure -a. In the case of faulty dependencies that cannot be resolved, aptitude -f install may fix it.

Also, you should make sure that the kernel metapackage is installed, which is similar to linux-image-amd64. If you have only the linux-image-4.9.0-9-amd64 package installed, your kernel may not be updated as needed. You can verify that it is installed by running apt install linux-image-amd64.

Updating all current packages

All packages must be updated to the latest version before updating the release. This is necessary in order to minimize all possible problems.

apt update
apt upgrade
apt autoremove --purge
reboot

Modifying Package Lists

Next, all package lists should be updated from Stretch to Buster. You can do this manually using the following:

nano /etc/apt/sources.list /etc/apt/sources.list.d/*

Upgrading to Debian 10

First you need to update the list of packages Debian 10

apt update

Next, update the packages themselves:

apt upgrade
apt dist-upgrade

During the upgrade, you may be asked if you want to restart the services. You can safely say no, as you will reboot later.

After which, you can reboot

reboot

Cleanup

It is necessary to make sure that your server has been updated when you started lsb_release -a. The conclusion should look like this.

No LSB modules are available.
Distributor ID: Debian
Description:    Debian GNU/Linux 10 (buster)
Release:        10
Codename:       buster

You can remove any remaining dependencies with apt autoremove --purge.