Applied the 'fix' from Comment #11 by vmc(vmclark) in Linux Mint 20. The error is no longer logged. Some boots on my HP laptop with a 5400RPM spinning Hard drive are slow but some are faster but some around the same time with lz4. Hard disk performance on my laptop is better with gzip than lz4. With lz4 the PC extremely lags when some apt packages are being set up and configured and some final configurations after most or all packages are installed, set up and configured but with gzip, the lag never occurs and PC is usable. Hard disk read benchmarks are better with gzip than with lz4. I think that lz4 is more suitable for an SSD than a spinning hard drive
Applied the 'fix' from Comment #11 by vmc(vmclark) in Linux Mint 20. The error is no longer logged. Some boots on my HP laptop with a 5400RPM spinning Hard drive are slow but some are faster but some around the same time with lz4. Hard disk performance on my laptop is better with gzip than lz4. With lz4 the PC extremely lags when some apt packages are being set up and configured and some final configurations after most or all packages are installed, set up and configured but with gzip, the lag never occurs and PC is usable. Hard disk read benchmarks are better with gzip than with lz4. I think that lz4 is more suitable for an SSD than a spinning hard drive