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I have a PC with a 500GB SSD and a dual boot setup. I allocated 430GB to Windows and 70GB to Ubuntu. Now, the Ubuntu partition is full, so I added a 1TB internal HDD. I allocated 500GB to Windows and formatted the remaining 500GB as ext4. I want to instruct Ubuntu to install new software in the 500GB partition since the 70GB partition is full. Could you please guide me on how to do this?"

Mahdi Daoud
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    Very very very bad idea: Linux is not made to break up its system onto 2 disks; if one of the two is slow to boot up it will crash your boot sequence. The Ubuntu core does not need a lot of space. I would advice to move your personal files to that partition and leave "/home/" bare (keep configs etc there but nothing else). If you want to do this you need to install software from source and compile it yourself. – Rinzwind Jul 17 '23 at 17:12
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    Better method: format the 500Gb into NTFS (since you are still using windows). Mount the partition in /etc/fstab then move your personal files to that 500 Gb and use that as your playground. Keep /home/ as is. Makes it easy to reinstall, do maintenance and create personal backups. – Rinzwind Jul 17 '23 at 17:15
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    Lets-move-applications-around is a classic mistake made by Windows power users. Ubuntu does not work like Windows. The advice from @Rizwind is excellent -- heed it. – user535733 Jul 17 '23 at 17:36
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    See the Filesystem Hierarcy Standard at https://refspecs.linuxfoundation.org/fhs.shtml, or read man hier.

    It explains where things go.

     – waltinator Jul 17 '23 at 17:38
  • Please check this answer to a person who had a bit similar idea as you: https://askubuntu.com/questions/1475863/installing-ubuntu-instead-of-windows-10/1475911#1475911 . It explains the differences between how disk space is organized in Linux and Windows. – raj Jul 17 '23 at 17:44
  • During your installation, you can choose to put your /usr or /var in the other partition – Archisman Panigrahi Jul 17 '23 at 17:48
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    @ArchismanPanigrahi Yes, theoretically you can, but it's not a very good idea, because if / mounts, and /usr or /var fails to mount, you basically get an unusable system. Contrary to some older systems, in current Ubuntu there is no separate /bin directory that contains "emergency" binaries that can be used in such case. – raj Jul 17 '23 at 17:57
  • where I said "500" in my 2nd comment: make that the whole 1Tb. Format as ntfs or exFAT and you can use it for personal data from both systems. – Rinzwind Jul 17 '23 at 18:14
  • You might find the question Installing programs in root vs home partitions? and its answer useful. – user68186 Jul 17 '23 at 19:09
  • Better to move /home which probably is where you are using most of the space in your 70GB. You can install and use ncdu from / or just use du from each directory to see where data is. Move Home & https://ubuntuforums.org/showthread.php?t=2455822&p=14010437#post14010437 And/or mount partitions as data partitions: https://askubuntu.com/questions/1013677/storing-data-on-second-hdd-mounting & https://askubuntu.com/questions/1058756/installing-all-applications-on-a-ssd-disk-and-putting-all-files-on-hdd-disk – oldfred Jul 17 '23 at 19:46

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