This sounds like there was still some process running and locking the dpkg status database and therefore the rest of the upgrade failed.
It does not look like a missing language-support-en is related.
From term.log:
updateStatus: Zwischenspeicher wird gelesen
updateStatus: Paketverwaltung wird überprüft
updateStatus: Aktualisiere Informationen zu Paketdepots
updateStatus: Paketverwaltung wird überprüft
updateStatus: Calculating the changes
updateStatus: Fetching
updateStatus: Systemaktualisierung wird durchgeführt
'utf8' codec can't decode byte 0xc2 in position 254: unexpected end of data
'utf8' codec can't decode byte 0xab in position 0: unexpected code byte
'utf8' codec can't decode byte 0xc3 in position 254: unexpected end of data
'utf8' codec can't decode byte 0xbc in position 0: unexpected code byte
'utf8' codec can't decode byte 0xc3 in position 254: unexpected end of data
'utf8' codec can't decode byte 0xbc in position 0: unexpected code byte
'utf8' codec can't decode byte 0xc2 in position 254: unexpected end of data
'utf8' codec can't decode byte 0xab in position 0: unexpected code byte
'utf8' codec can't decode byte 0xc2 in position 254: unexpected end of data
'utf8' codec can't decode byte 0xab in positiondpkg: Status-Datenbank-Bereich ist von einem anderen Prozess gesperrt
dpkg: Status-Datenbank-Bereich ist von einem anderen Prozess gesperrt
[...message above repeated a lot of times...]
Fontconfig warning: "/etc/fonts/conf.d/53-monospace-lcd-filter.conf", line 17: invalid constant used : legacy
X Error: BadDrawable (invalid Pixmap or Window parameter) 9
Major opcode: 62
Minor opcode: 0
Resource id: 0x3017406
Xlib: sequence lost (0x360a32 > 0x350a32) in reply type 0x0!
X Error: BadImplementation (server does not implement operation) 17
Major opcode: 20
Minor opcode: 0
Resource id: 0xb0e7e70
Xlib: sequence lost (0x3601ed > 0x352684) in reply type 0x1c!
Xlib: sequence lost (0x36000c > 0x352684) in reply type 0x6!
X Error: BadPixmap (invalid Pixmap parameter) 4
Major opcode: 54
Minor opcode: 0
Resource id: 0x30173f0
X Error: BadPixmap (invalid Pixmap parameter) 4
Major opcode: 54
This sounds like there was still some process running and locking the dpkg status database and therefore the rest of the upgrade failed.
It does not look like a missing language-support-en is related.
From term.log: erung wird durchgeführt Datenbank- Bereich ist von einem anderen Prozess gesperrt Datenbank- Bereich ist von einem anderen Prozess gesperrt conf.d/ 53-monospace- lcd-filter. conf", line 17: invalid constant used : legacy
updateStatus: Zwischenspeicher wird gelesen
updateStatus: Paketverwaltung wird überprüft
updateStatus: Aktualisiere Informationen zu Paketdepots
updateStatus: Paketverwaltung wird überprüft
updateStatus: Calculating the changes
updateStatus: Fetching
updateStatus: Systemaktualisi
'utf8' codec can't decode byte 0xc2 in position 254: unexpected end of data
'utf8' codec can't decode byte 0xab in position 0: unexpected code byte
'utf8' codec can't decode byte 0xc3 in position 254: unexpected end of data
'utf8' codec can't decode byte 0xbc in position 0: unexpected code byte
'utf8' codec can't decode byte 0xc3 in position 254: unexpected end of data
'utf8' codec can't decode byte 0xbc in position 0: unexpected code byte
'utf8' codec can't decode byte 0xc2 in position 254: unexpected end of data
'utf8' codec can't decode byte 0xab in position 0: unexpected code byte
'utf8' codec can't decode byte 0xc2 in position 254: unexpected end of data
'utf8' codec can't decode byte 0xab in positiondpkg: Status-
dpkg: Status-
[...message above repeated a lot of times...]
Fontconfig warning: "/etc/fonts/
X Error: BadDrawable (invalid Pixmap or Window parameter) 9
Major opcode: 62
Minor opcode: 0
Resource id: 0x3017406
Xlib: sequence lost (0x360a32 > 0x350a32) in reply type 0x0!
X Error: BadImplementation (server does not implement operation) 17
Major opcode: 20
Minor opcode: 0
Resource id: 0xb0e7e70
Xlib: sequence lost (0x3601ed > 0x352684) in reply type 0x1c!
Xlib: sequence lost (0x36000c > 0x352684) in reply type 0x6!
X Error: BadPixmap (invalid Pixmap parameter) 4
Major opcode: 54
Minor opcode: 0
Resource id: 0x30173f0
X Error: BadPixmap (invalid Pixmap parameter) 4
Major opcode: 54