I've unstalled 'localepurge' but its purges linger on in
'debdelta-upgrade' errors like this one:
Downloaded, time: 113.82sec speed: 5218/sec : lilypond_2.12.3-6_2.12.3-7_i386.debdelta
Error: applying of delta for lilypondfailed: : localepurge removed 15 files. (non retriable) <class '__main__.DebDeltaError'>localepurge removed 15 files. (non retriable)
It seems 'debdelta-upgrade' did this:
1) spent 113 seconds downloading a delta.
2) noticed that 'localepurge' zapped some files.
3) gave up on that delta.
Maybe 'debdelta-upgrade' could do something like:
1) notice that 'localepurge' zapped some files.
2) give up on that delta.
2a) otherwise fetch the delta as before...
Since 'localepurge' users and ex-users wait through dozens of such
errors, several minutes might be saved.
HTH...