I don’t know if I am doing OK, as I tried to install it but installation gets stuck at “Saving installed packages…” and it doesn’t continue. I wonder if it could be cause I didn’t partitioned as I had to. I don’t find any post where this happens so I ask here.
Your partitioning scheme is too complicated and there’s not enough space in / . At least 25GB is recommended for / and you’ll probably need more than that. We can discuss the exact amount of / that is required. All you need is / and swap and optionally /home. With an SSD you don’t need to allocate that much swap space, in fact just accept the default swap space which is allocated by the Ubuntu installer.
The more information that you provide, the more specific the recommendation can be. Let’s start with a general recommendation. SSDs are rugged and durable so read and write cycles is not the most important issue. Disk space on an SSD is expensive compared to disk space on an HDD so it’s important to conserve valuable space on the SSD by not cluttering it with unnecessary partitions.