The Linux Mint team never pushes anyone into upgrading to the latest version of their distribution but curiosity often is strong enough an impulse to make me do just that. When it brings me across some rough edges, then the wisdom of leaving things alone is evident. Nevertheless, doing so also brings its share of learning and that is what I am sharing in this post. It also also me to collect a number of titbits that may be of use to others.
Again, I went with the in-situ upgrade option though the addition of the Timeshift backup tool means that it is less frowned upon than once would have been the case. It worked well too part from slow start-up and shutdown times so I set about track down the causes on the two machines that I have running Linux Mint. As it happens, the cause was different on each machine.
On one PC, it was networking that holding up things. The cause was my specifying a fixed IP address in /etc/network/interfaces instead of using the Network Settings GUI tool. Resetting the configuration file back to its defaults and using the Cinnamon settings interface took away the delays. It was inspecting /var/log/boot.log that highlighted problem so that is worth checking if I ever encounter slow start times again.
As I mentioned earlier, the second PC had a very different problem though it also involved a configuration file. What had happened was that /etc/initramfs-tools/conf.d/resume contained the wrong UUID for my system’s swap drive so I was seeing messages like the following:
W: initramfs-tools configuration sets RESUME=UUID=<specified UUID for swap partition>
W: but no matching swap device is available.
I: The initramfs will attempt to resume from <specified file system location>
I: (UUID=<specified UUID for swap partition>)
I: Set the RESUME variable to override this.
Correcting the file and executing the following command fixed the issue by updating the affected initramfs image for all installed kernels and speeded up PC start-up times:
sudo update-initramfs -u -k all
Though it was not a cause of system sluggishness, I also sorted another message that I kept seeing during kernel updates and removals on both machines. This has been there for a while and causes warning messages about my system locale not being recognised. The problem has been described elsewhere as follows: /usr/share/initramfs-tools/hooks/root_locale is expecting to see individual locale directories in /usr/lib/locale but locale-gen is configured to generate an archive file by default. Issuing the following command sorted that:
sudo locale-gen --purge --no-archive
Following these, my new Linux Mint 19 installations have stabilised with more speedy start-up and shutdown times. That allows me to look at what is on Flathub to see what applications and if they get updated to the latest version on an ongoing basis. That may be a topic for another entry on here but the applications that I have tried work well so far.